PNG ICO ICNS MORE
Mixed
Smooth
Bunch of Bluish Icons
group, Idea
Black
512x512
Idea, user
Idea
3D
Shine 7
light, Idea, bulb
400x400
Business & finance
Seven General Icons
Light bulb, Idea
256x256
Sunny day General Icons
Stroke
bulb, light, Idea
UI
Developer Kit
bulb, Idea, light
128x128
Network & communications
BeOS
jabber, lightbulb, Idea
PNG MORE
Desktop apps
Free Applications Icons
Electric, shock, Energy
24x24
Computer & hardware
Human o2
Idea, lamp, light
lightbulb, Idea, power
Pixel
Tango
Dialog, Idea, Information
32x32
Glyph
Ecqlipse 2
Idea, lightbulb
Futurosoft
security, shield, win
Oxygen
Light bulb, Idea, power
Shopping & e-commerce
Siena
Idea, yellow, bulb
KDE Crystal Diamond
22x22