PNG ICO ICNS MORE
Desktop apps
Pixel
Splashyfish
shrink, Resize, Application
DarkSeaGreen
16x16
windows, Up, Application
WhiteSmoke
windows, Application, warning
windows, Applications
UI
Tango
system, preferences, windows
32x32
Computer & hardware
ASP.NET icons
windows
RoyalBlue
tile, windows, vertically