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Photography & graphic design
3D
32x32 Free Design Icons
cross, red, cancel
Black
32x32
no entry, no, cancel
Signs & symbols
Free 3d Glossy Interface Icon Set
delete, Exit, Entry
64x64
Arrow, session, logout
erase, err, reject
stop, remove, Error
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UI
Gnome Web Icons
64, Application, Exit
Mixed
Vista Style Base Software
Add, Exit, delete
256x256
Must Have
out, sign out, Exit
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Desktop apps
Free Applications Icons
delete, no, Cancelled
24x24