Redbubble seems to be the only service where you can load fan stuff without them censoring it for mentions of the word Supernatural, or representations of actors faces. Cafe Press and Zazzle are hopeless (well in my experience, though I've seen stuff on there being sold which seems to breach all their rules so maybe it's just me tagging things wrong or something).

Click on the pic to go to Redbubble and check it out - it's easy to set up an account there too.