White Spherical Robot — Curious

1024 × 768

Crowbar in Display Case — Black, Dark, Digital Art

1600 × 1000

White Robot with Red Light — Gray, Calm, Digital Art, Red Heart

1440 × 900

Abandoned Robot in Ruins — Gray

1680 × 1050

Woman and Robot in Ruins — Blue

1280 × 800

Woman Holding Portal Gun — White, Dramatic, Digital Art, Robot

1084 × 1600

Portal game ending scene

1920 × 1200

Armored Core Last Raven robot

1280 × 1024

Mech in War Zone — Black

1440 × 900

Chell and the Aperture Science portal

1680 × 1050

Robot Using Portals

1600 × 1200

Robot with Laser Beam — Gray

2560 × 1080