I've had some luck in the past with sites like OpenDesigns and FreeCSSTemplates -- they offer (mostly) CC-licensed HTML templates; you'll have to add the Django template stuff yourself. As James pointed out though, most of them will get you up and running, but you almost always want to take things a step further.
My advice: build up a small library of re-usable templates (using stuff from the above sites), get real comfortable editing HTML and CSS (because you will edit HTML and CSS), then find some kickass designers (preferably local) and get real friendly with them. Perhaps you can trade favors; you do some coding work for them, for free, and in return they do some design work for you. I've found that even if you have to pay, a good designer is well worth the money (seriously, who wants to spend their time testing sites in IE6?).
Good luck with your search though -- I, for one, would love to see your findings.
