PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
lightning
DarkGoldenrod
16x16
Smooth
Ultimate Gnome
weather, power, lightning
Black
256x256
weather, Storm, lightning
128x128
PNG MORE
Desktop apps
3D
Free Applications Icons
Electric, shock, Energy
24x24
Bolt, weather, thunder
Weather
Sticker Weather
weather, Cloud, lightning
BWPX
Database, lightning
WhiteSmoke
18x18
table, lightning, Database
Diagona Icons
power, lightning
Mixed
Led Icons
Application, lightning
lightning, Page
SteelBlue
lightning, weather
DarkGray
Silk
weather, lightning
Photography & graphic design
Dark Glass
lightning, power, Disk
DarkSlateGray
lightning, quick, restart
SaddleBrown
Computer & hardware
Futurosoft
power, lightning, Winamp
Gold
Glaze
quick, lightning, power
Silver
64x64
ASP.NET icons
power, Connect, lightning
power, lightning, Connect
Circular
lightning, Element
LightSeaGreen
lightning, Arrow
exclamation, lightning
Minus, lightning