PNG ICO ICNS MORE
Max Mini Icon
inbox
DodgerBlue
16x16
PNG ICO MORE
Aroma
SaddleBrown
24x24
Glyph Icons
Black
32x32
Retina
Silver
64x64
Faenza
inbox, mail
Boolean
inbox, Full
LightSteelBlue
PNG MORE
Spirit20
mail, Add, inbox
DarkGray
20x20
delete, inbox, mail
mail, inbox, Edit
Super Mono
DeepSkyBlue
Wireframe Toolbar Icons
Gainsboro
48x48
Reflection
128x128
Eloquence!
Goldenrod
Toolbar icon set
Peru
256x256
Simple But Sophisticated
iPhone style sidebar icons
Alt, inbox
Sienna
Wireframe Mono
Dark Glass
inbox, Folder
DarkSlateGray
Folder, inbox
Nuvola
Oxygen-Refit
WhiteSmoke