PNG ICO ICNS MORE
Mixed
3D
Bright
envelope, Email, plus
WhiteSmoke
479x479
plus, Email
Black
512x512
Minus, plus
Blue, Add, plus
SteelBlue
Add, plus, Minus
482x482
plus, Add, green
OliveDrab
plus, green
Blue, plus, search
plus, search, green
Desktop apps
3D Cartoon Icons Pack
plus, Bittorrent
300x300
Social media
Free 3D Social Icons
knob, netvibes, tack
LimeGreen
Arrows
Orb
Add, plus, insert
Silver
128x128
Vista Style Base Software
+, Add, plus
256x256
The Spherical icon set
plus, Add
MidnightBlue
Signs & symbols
plus, Minus, Blue
RoyalBlue
PNG MORE
Free Applications Icons
create, addition, medical
24x24
summary, Page, Add
Business & finance
Phuzion
Add, plus
32x32
Computer & hardware
Human o2
Folder, plus, Add
Chocolate
Wifi, Add, plus
Orb icons
Flavour Extended
button, Add, Blue
CornflowerBlue
48x48
button, green, plus
ForestGreen