PNG ICO ICNS MORE
Signs & symbols
3D
Free 3d Glossy Interface Icon Set
erase, err, reject
Black
64x64
cancel, wrong, Error
OrangeRed
stop, remove, Error
Must Have
approve, cancel, delete
Firebrick
256x256
Close, no, reject
PNG MORE
Desktop apps
Free Applications Icons
remove, delete, reject
Crimson
24x24
reject, no, wrong
delete, no, Cancelled
Photography & graphic design
Dark Glass
Exit, delete, remove
SlateGray
128x128
UI
Nuvola
reject, x, delete
DarkRed
48x48