I'm not sure of the possibility of these, but:
-Pilotwings 64
-Donkey Kong 64 with the ability to switch Kongs on the fly
-Paper Mario 64: Skelux's Co-op mod
Pilotwings doesn't run very well, or at all, when injected into wads and wups, and not64/wii64 don't handle it well either. Same goes for...