I have a number of large and small MUSH concepts, including:
A Marvel NYC game centered around Spider-Man, with a combat system centered around environmental victories instead of straight hit/dodge damage/endurance.
A fighter jet combat system, for Star Fox or UN Squadron or another dogfight game, with free form IC pose range and high stakes for actually getting hit.
An extensive news file set for a spy MUSH with a Romance of the Three Kingdoms faction structure based on the Cold War and set in outer space, with a basic combat sketch of interlocking concepts.
A modern thief code sketch with five different mini-systems that connect with each other, forming a pentagonal game based on five math forms.
A combined Ghosts of Mars/Doom/Cowboy Bebop/Total Recall game set on Mars, Phobos, and Deimos, with news files written out, but no combat system dynamic elected on.
A nuclear summer theme set in Polynesia, with a unique theme encouraging an open ended futuristic piracy republic. No combat system written.
If anyone wants any of these write-ups, get in touch.