Do Not Feed Sign — Gray

1920 × 1080

No Smoking Sign

1284 × 1025

Biohazard Symbol — Green, Warning, Vector Art

1600 × 1200

Warning Sign with Explosion

1922 × 1200

Erwin Schrödinger Portrait — Red, Warning

1920 × 1200

Sniper Rifle Sign — Black, Serious

1920 × 1080

Man Kicking Another Man — Yellow, Humorous, Vector Art

1920 × 1080

Black Hand Print

1280 × 960

Silhouetted People Figures

1920 × 1200

Pink Figure in Crowd

1920 × 1080

Person Sitting under Sun

1280 × 1024

thinking cap warning

1600 × 1200