Portal device in a chamber

1024 × 768

Glowing Blue Portal Device

1280 × 800

Robotic Sphere with Blue Light — Dramatic, Night, Digital Art

1600 × 900

Robot with Blue Eye — Calm

1602 × 1024

Aperture Laboratories Logo — Blue, Dramatic, Digital Art

1920 × 1200

Aperture Laboratories Logo — Dramatic

1638 × 1024

Companion Cube — Blue

1920 × 1200

Skeletal Figure in Blue Light

800 × 600

Alien City in Space

1280 × 1024

Spartan Soldier in Armor — Blue, Dramatic, Digital Art, Helmet

3713 × 4725

Spartan Soldier with Rifle — Blue, Dramatic, Night

1920 × 1080

Soldiers in Tactical Gear — Blue, Dramatic

1920 × 1200