Aperture Laboratories Logo — Black, Dark, Industrial

1440 × 900

Two Robots in Corridor — White, Neutral

1920 × 1080

Woman Walking in Corridor — White

2844 × 1600

Robots in a Test Chamber

1920 × 1080

Two Robots in Corridor — White, Mechanical

1920 × 1080

Chell with Robots — White

1920 × 1080

Soldier in Blue Armor — Dramatic, Night, Digital Art

1024 × 768

alien head made of skulls

1680 × 1050

Robot Torso with Glowing Core — Black

1920 × 1200

Halo game logo and armor

1280 × 800

mecha in a hangar

1920 × 1080

Cyborg Soldier — Black, Dramatic, Night

1920 × 1200