In terms of Ghostbusters and TMNT, I've mentioned during SA7 that I'd see a thrill ride of some sort for TMNT. I had designed a slot car attraction in that competition, but a KUKA Arm coaster, a motion-based dark ride, or even just a roller coaster would fit the IP well.
As for Ghostbusters, a shooter dark ride really is the most obvious route to take, given the idea of wielding weapons akin to proton packs to hunt ghosts with. Of course, a trackless dark ride could also work, or even a bus dark ride (my term for high-capacity dark rides like Kongfrontation) with us as citizens while ghosts are getting loose might be another tack. Honestly, a drop tower might be possible, though that could seem a little close to Tower of Terror.