Image Galleries.

Aethereality Gallery
Digik Gallery
Harry Ootter Screencaps
RIOT
Stock.xchng
Sweet and Talented

Resources such as brushes, textures, and patterns.

Riot!
Vert Gazon
Appendix²
Sanami276
FEEL
Damnicons
Loveicon
Mystique87
Dusty Memories
Manjo Ninja
Gender
Papercuts
Arisubox
Ewanism
Eveningwalk
Threeeyespei
In the Orchard (closed)
Funeral Monster (closed)
Shizoo
77words (Patterns only)
Graphic_sl
Unmasked-Icons
Inxsomniax

Other crediting.

Adobe Photoshop
Icon Sort