(1) After the war, the Malfoys get off light, but their family assets have been seized, and no one wants to employ them. As a last shot at making a living, they form a wizard rock band... and become a success. Pairing: gen, or Harry/Draco.
(2) As a result of a time travel accident, the original four Founders of Hogwarts have been replaced by Umbridge, Lockhart, Trelawney or Luna, and Filch. What is the new Hogwarts like (house colours, badges, Sorting criteria, placement of the Trio...)?
The first one is going to make me do some research on wizard rock. I'm well aware of what it is, and at Lumos I saw Harry and the Potters and a couple of other acts, but I want to know enough to write good crack!fic. And sadly, the prospect of doing this research is making me quite gleeful. As for the second prompt, it's got a lot of gold to mine, so the "only" prep I'll be doing is rereading canon (which I was doing anyway, because I want to get back to Yellow, the poor neglected WIP überfic of my heart and soul, but I feel like I've lost touch with canon, not having read it for going on three years, aside from a single read of Deathly Hallows).
And now the crack and my prior post on reality TV have made me want to write a fic that...well, I won't give too much away, but let's just say it's a crossover between Harry Potter and The Maury Povich Show. Perhaps that shall also give me an excuse to do "canon research" on Maury (i.e., watching more episodes). *shiftyeyes*