PNG ICO ICNS MORE
Network & communications
Pixel
16x16 Free Application Icons
linux, cmd, bird
Black
16x16
PNG MORE
Mixed
IconSweets 2
expression engine, linux, tux
40x40
File, document, Penguin
Led Icons
tux, White, Penguin
Goldenrod
UI
Silk
tux, Penguin
DarkSlateGray
Penguin, Page, White
Snow