Dang, really hard decision. Made harder by the fact that I won't even
be here to witness it, much less join in. xD
Well, Critters has a lot going for it; it's a busy time of year, we've never done Critters, and you can actually make some unique stuff. It's simple, so we could get some new blood, etc etc. Challenge of making a unique Critter that is well-defined and uses in-game stuff, blah blah.
Then again, Morphing. Morphing is one of the coolest things on this green Earth.
I'm sure we've done one of these before, but who's to say we can't again? Not me. So many ideas here (as Mr. Bob pointed out, buildings/units/heroes/etc), and so many of them awexome.
Music sounds neat, but not as much as the others; sorry.
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Since I have no bearing in this, I won't vote. But it's really a toss-up, IMO.