PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
task, plus
DarkSlateGray
16x16
plus, telephone
LightGray
Traffic, plus, cone
DarkRed
Usb, Flash, plus
DimGray
water, plus
SteelBlue
frame, octagon, plus
plus, button
LimeGreen
plus, White
RoyalBlue
plus, octagon
Green
White, plus
expand, plus, toggle
PC 100 Icon Pack
Add, plus
DarkOrange
32x32
Mixed
plus
YellowGreen
Signs & symbols
Kiwi
plus, Add, increase
Desktop apps
Sizicons
WooFunction Icon set
Add, plus, green
plus, Newspaper, Add
WhiteSmoke
PNG MORE
Tiny icons
ForestGreen
10x10
Door, plus
SaddleBrown
plus, Drawer
plus, Drill
drive, plus
envelope, plus
DarkGoldenrod
plus, equalizer
DarkGray