It would almost be a crime for me not to enter this one... fortunately, I have a raft of spells ready for (almost) immediate release! They'll make a nice teaser for my next megaproject.
I would say that for the first contest, 'no theme' is appropriate. Though as it happens, the spells I'm planning to issue are fey-themed, which is kind of extraplanar. So I wouldn't mind too much if that theme is used.