I'm going to make a mod that turns the doom3 world into something like GTA:Vice City but it's set in the year 2030 and you're the mayor so you can keep building the city up the way you want it like in SimCity and you can have your own personal house and a job (besides being mayor) like in the sims. It will also be capable of thousands of simultaneous players per server so it will need an economy and PVP.
I can do all the sounds myself but I won't have a whole lot of time to work on the rest of stuff to the quality that's expected so I am currently looking for experienced coders, mappers, modelers, texture artists and witchdoctors...