MadSage
MadSage Skin
MadSage is another player created skin, which is no longer maintained, but put here for completeness. PaulWalker recently posted a thread in the official forums with a download link to the MadSage skin which is apparently up and running.
Where to Download
For now, see the thread linked to above.
How to Install
1. Move the entire skin.zip folder to your shadowbane/skins/ folder.
2. Load up Shadowbane.
3. Hit escape to access main menu, go to Settings, Interface Skins, and select "MadSage".