What about a game less nintendo-ish?
There's some games I would love to see in 3d. Something like an ad-hoc or offline Trackmania style game for 3DS could be great and would make a great use of the stereoscopic display.
Ugh... well, I haven't done 3D rendering before :/ I'm stuck in 2D
I don't think I would be able to port/recreate a game with this complexity. Nintendo games are simple yet fun, so it's easy to recreate them