I use icon brushes and/or gradients created by the following people:

claudia6913
hecatesknickers
leftofmyheart
spiffydaze
pekeana
inexorablyhere
teh_indy
crushedviolet
crumblingwalls
sp0rks
quebelly
elli
serendipitysho
cosmo_mouse
mapother
__kali__
anesthezea
wednesday_icons
framedinblood
nellenoir
tg0newiththesin
hotoko
serenecalamity
masquerademasks
elledriver_
brokenicon
crystalkirk
fluffy_monster
teh_brushes
bittersweet_art
cdg_brushes
daughterofsnope