You can read about setting up applications for displaying in trades here. To display trades of a single application, select it from the list:

Diatribe III
x1
Steam
Background
Diatribe III
Type: TeraBlaster Uncommon Profile Background
Diatribe III
Space 4
Steam
x0
Background
Space 4
Type: Defy Gravity Profile Background
Market price: ~0.06 USD
Robofall
x1
Steam
Background
Robofall
Type: Cyborg Detonator Uncommon Profile Background
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
The Easy Enemies
x1
Steam
Background
The Easy Enemies
Type: Dungeon of Zolthan Profile Background
Market price: ~0.03 USD
Avoid cubes and spiky enemies with some timing and a few bullets.
The Easy Enemies
x1
Steam
Background
The Easy Enemies
Type: Dungeon of Zolthan Profile Background
Market price: ~0.03 USD
Avoid cubes and spiky enemies with some timing and a few bullets.
Robby
x1
Steam
Background
Robby
Type: Cyborg Detonator Rare Profile Background
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Dungetris
x1
Steam
Background
Dungetris
Type: Dungetris Rare Profile Background
Market price: ~0.03 USD
With love
Forest
x1
Steam
Background
Forest
Type: Farnham Fables Profile Background
Market price: ~0.03 USD
The clearest way into the Universe is through a forest wilderness.
Robo Rocket
x1
Steam
Background
Robo Rocket
Type: Cyborg Detonator Profile Background
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Native Lizard People (Profile Background)
x1
Steam
Background
Native Lizard People (Profile Background)
Type: Farnham Fables Uncommon Profile Background
Market price: ~0.03 USD
Let us be grateful to people who make us happy, they are the charming gardeners who make our souls blossom.
Native Lizard People (Profile Background)
x1
Steam
Background
Native Lizard People (Profile Background)
Type: Farnham Fables Uncommon Profile Background
Market price: ~0.03 USD
Let us be grateful to people who make us happy, they are the charming gardeners who make our souls blossom.
Space 1
Steam
x0
Background
Space 1
Type: Defy Gravity Profile Background
Market price: ~1.34 USD
The Stadium
x1
Steam
Background
The Stadium
Type: Rocket League Profile Background
Market price: ~0.08 USD
The pitch is surrounded by force-deflection fields, maximizing visibility while protecting spectators from rocket flames and explosions.
Poisonous fangs
x1
Steam
Background
Poisonous fangs
Type: MontaSayer Profile Background
Poisonous fangs
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Poisonous fangs
x1
Steam
Background
Poisonous fangs
Type: MontaSayer Profile Background
Poisonous fangs
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Etaria | Adventure Begins
x1
Steam
Background
Etaria | Adventure Begins
Type: Etaria | Survival Adventure Profile Background
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Track Day
x1
Steam
Background
Track Day
Type: DiRT 3 Complete Edition Profile Background
Market price: ~0.03 USD
Holding Pattern
Steam
x0
Background
Holding Pattern
Type: Counter-Strike: Global Offensive Rare Profile Background
Market price: ~0.1 USD
Avatar
Noxxu
Zombie (Profile Background)
x1
Steam
Background
Zombie (Profile Background)
Type: Russian SuperHero Dead Ivan Rare Profile Background
Market price: ~0.03 USD
Fairy-child, if only you should take my hand, I would show you things beyond your wildest dreams.
Nightmare (Profile Background)
x1
Steam
Background
Nightmare (Profile Background)
Type: Merger 3D Uncommon Profile Background
Market price: ~0.03 USD
A human being becomes human not through the casual convergence of certain biological conditions, but through an act of will and love on the part of other people.
Demon (Profile Background)
x1
Steam
Background
Demon (Profile Background)
Type: Just Hero Uncommon Profile Background
Market price: ~0.03 USD
Heroes don't get anything but dead.
Arena
x1
Steam
Background
Arena
Type: BitMaster Profile Background
Market price: ~0.03 USD
I'm not weird, I'm just limited edition.
I'm just a Hero (Profile Background)
x1
Steam
Background
I'm just a Hero (Profile Background)
Type: Just Hero Profile Background
Market price: ~0.03 USD
I would describe a hero as a person who has no fear of life, who can face life squarely.
Sakura Nova
Steam
x0
Background
Sakura Nova
Type: Sakura Nova Rare Profile Background
Market price: ~1.73 USD
Guarded
x1
Steam
Background
Guarded
Type: Counter-Strike: Global Offensive Profile Background
Market price: ~0.08 USD
Space
Steam
x0
Background
Space
Type: Anode Rare Profile Background
Market price: ~5 USD
Guarded
x1
Steam
Background
Guarded
Type: Counter-Strike: Global Offensive Profile Background
Market price: ~0.09 USD
Holding Pattern
x1
Steam
Background
Holding Pattern
Type: Counter-Strike: Global Offensive Rare Profile Background
Market price: ~0.1 USD
Fighting spirit
x1
Steam
Background
Fighting spirit
Type: EM: Shader Attack Profile Background
Market price: ~0.03 USD
Dungeon
Steam
x0
Background
Dungeon
Type: WazHack Rare Profile Background
Market price: ~0.24 USD
Night
x1
Steam
Background
Night
Type: 35MM Profile Background
Market price: ~0.24 USD
Ammo
x1
Steam
Background
Ammo
Type: Lup Profile Background
Market price: ~0.03 USD
Hacknet Red
x1
Steam
Background
Hacknet Red
Type: Hacknet Rare Profile Background
Market price: ~0.12 USD
Concealment
x1
Steam
Background
Concealment
Type: Physic Monster Profile Background
Moonlit
x1
Steam
Background
Moonlit
Type: Terra Incognita ~ Chapter One: The Descendant Uncommon Profile Background
Market price: ~0.03 USD
Antistar (Profile Background)
Steam
x0
Background
Antistar (Profile Background)
Type: 0RBITALIS Rare Profile Background
Market price: ~0.43 USD
Star Blaster (Profile Background)
x1
Steam
Background
Star Blaster (Profile Background)
Type: Eaten Alive Rare Profile Background
Market price: ~0.03 USD
"When I was a kid, me and my best friend used to get lost for days in this game! I wonder what happened to him. You know, I never had any friends like the ones I did when I was young"
Rainbow
Steam
x0
Background
Rainbow
Type: Kabitis Uncommon Profile Background
Market price: ~0.03 USD
Blackwell Deception Sky
x1
Steam
Background
Blackwell Deception Sky
Type: Blackwell Deception Uncommon Profile Background
Market price: ~1.99 USD
Blackwell Deception Sky
Tropican Beach
Steam
x0
Background
Tropican Beach
Type: Tropico 5 Profile Background
Market price: ~1.25 USD
Background with Katrine
x1
Steam
Background
Background with Katrine
Type: Darkness Assault Profile Background
Market price: ~0.03 USD
Background with Katrine from intro.
Reuel
x1
Steam
Background
Reuel
Type: Elements: Soul of Fire Profile Background
Market price: ~0.03 USD
Ondine
x1
Steam
Background
Ondine
Type: Elements: Soul of Fire Profile Background
Market price: ~0.03 USD
Boaz
x1
Steam
Background
Boaz
Type: Elements: Soul of Fire Uncommon Profile Background
Market price: ~0.03 USD
Barroth
x1
Steam
Background
Barroth
Type: The I of the Dragon Profile Background
Market price: ~0.03 USD
2 Dragons
x1
Steam
Background
2 Dragons
Type: The I of the Dragon Rare Profile Background
Market price: ~0.03 USD
2 Dragons
x1
Steam
Background
2 Dragons
Type: The I of the Dragon Rare Profile Background
Market price: ~0.03 USD
Morrogh
x1
Steam
Background
Morrogh
Type: The I of the Dragon Profile Background
Market price: ~0.04 USD
Morrogh
x1
Steam
Background
Morrogh
Type: The I of the Dragon Profile Background
Market price: ~0.04 USD
Piles of Friendcubes
x1
Steam
Background
Piles of Friendcubes
Type: Why So Evil Profile Background
Common blue Friendcubes background
This item can no longer be bought or sold on the Community Market because Valve no longer has a business relationship with the developer.
Space 1
Steam
x0
Background
Space 1
Type: Defy Gravity Profile Background
Market price: ~1.28 USD