PNG ICO ICNS MORE
Desktop apps
Smooth
One bit
Protection, shield, Antivirus
Teal
48x48
shield, Antivirus
Chocolate
Shopping & e-commerce
Woothemes Ultimate Icon Set
shield
Black
128x128
web, shield
Computer & hardware
Futurosoft
Clean, shield, Check
ForestGreen
Blue, help, shield
shield, Protection
Silver
windows, Folder, shield
security, shield, win
32x32
Siena
green, shield, protect
256x256
shield, Blue, protect
red, shield, protect
protect, shield
DimGray
yellow, protect, shield