Create custom icons by combining images and texts as you like.
You can create & adjust custom icon images and save settings as you configure (size, location, background, variant, etc.) in the main program.
Then your settings can be used to attach your custom icons via iCCMPlugin (a Finder contextual menu item).
[Note] Adding variant icons shows no effect under OSX v.10.5.2, which is a bug confirmed by Apple. Unfortunately having no workaround found yet, we need to wait for fix in a later version.