PNG ICO ICNS MORE
Desktop apps
Smooth
Farm-fresh
calculate, Book keeping
Sienna
32x32
Mixed
Bunch of Bluish Icons
calculate, Reload, refrsh
MediumTurquoise
512x512
Music & multimedia
Soft Icons
Black board, math, school
SeaGreen
128x128
Network & communications
Oxygen
Blackboard, calculate, school
DarkSeaGreen