I think "Skulls" might be overdone, but if done correctly they can sell. They have been around since punk and metal, and haven't gone away yet. Check what they do at emptees.com with skulls then let me know that you are over them. I think a vector skull might be over done, but some of the artist and custom illys are making some headway..Matt Skiff, Jimiyo, Ray Frenden, Jeff Finely, some of those artists have no problem selling a tired style..Just my .06 cents