PNG MORE
Family & home
Pixel
IconBeast Lite
Not, Do, Disturb
Black
30x30
PNG ICO ICNS MORE
UI
Fugue Icons
Not, sign, Disturb
DarkSlateGray
16x16
Not, cross, sign
Gnome icons
Spam, Not
48x48
Desktop apps
Splashyfish
Not, Do, Error
Red
Do, Error, Not
Tango
junk, Not, mail
Gainsboro
32x32