PNG ICO ICNS MORE
Avatars & smileys
3D
Free Large Boss Icon Set
stupid, strong, power
Black
512x512
shiled, stupid, strong
knight, horseman, king
Gaming & gambling
Photorealistic
48x48 Free Object Icons
Antivirus, Guard, Army
48x48
UI
Pixel
Blueberry
protect, on, shield
OliveDrab
32x32
protect, shield, off
OrangeRed
Desktop apps
Glyph
16x16 Free Toolbar Icons
protect, Antivirus, yellow
Khaki
16x16
Shopping & e-commerce
Smooth
Siena
green, shield, protect
256x256
shield, Blue, protect
red, shield, protect
protect, shield
DimGray
yellow, protect, shield