PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
Application, sidebar, collapse
LightSteelBlue
16x16
PNG MORE
BWPX
collapse, Minus
Silver
18x18
Mixed
Mini icons 2
Minus, right, Arrow
Lavender
10x10
collapse, toggle
Gainsboro
toggle, collapse
RoyalBlue
Desktop apps
Diagona Icons
collapse, new, plus
DarkGray
Splashyfish
Blue, collapse, bullet
SteelBlue
Minus, collapse, bullet
Silk