Anime Girl Holding Gun — Blue, Energetic, Hat

800 × 600

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

1440 × 900

White Spherical Robot — Curious

1024 × 768

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

1680 × 1050

Person Falling into Portal — Blue, Dramatic, Digital Art, Arrow, Silhouette

1680 × 1050

White Robot with Red Light — Gray, Minimalist

1440 × 900

Portal robot in space

1152 × 720

Turret Sentry Robot — Black, Dramatic

1152 × 864

Robot in a Puzzle Room

1280 × 1024

Portal robot with quote

1440 × 900

Portal robot in action

1600 × 1200

Blue Aperture Symbol

2560 × 1600