White Cube with Heart Symbols — Gray, Neutral

1680 × 1050

White Robot with Red Light — Gray, Neutral

1920 × 1080

Portal Gun Device — White, Neutral

1024 × 768

Portal-themed digital artwork

2560 × 1440

Cat and Dog in Portals

1920 × 1200

Boy Hugging Creature — Green

1024 × 768

Mega Man in Action Pose — Blue

1920 × 1080

Four Colored Portals

1440 × 900

Cube with hearts and text

1600 × 1200

Cake Slice with Cherry

1440 × 900

Woman with Robot Companion — Blue

1024 × 768

sci-fi robot in a corridor

1280 × 720