Mac Apps for Themes
Folder Icon X
PaidCreate customized desktop folder icons from pictures, files, folders, or .icns documents.
Mac
TreetopLights
FreeDesktop Christmas tree and animated lights.
Mac
Makeover Democracy
Freereplacement icon set for Democracy Player
Mac
Camera Obscura Icons for iPhoto and Aperture
Freecustom Aperture & iPhoto icons
Mac