My dream RP is less what is being written and more who I'm writing with. I'd sell my left arm if I could once again get with my old circle of writers, and the bunch of us just throw ideas to the wall like we used to when we were all younger. I'd do anything to go back to the age where we could write from 8 PM to 4 AM before I'd collapse asleep on my keyboard. Those were the days. 

In terms of genre, I'd love to explore more worlds I plan on writing about in my novels next: my "post-apoc" steampunk story where instead of nuclear winter the aftermath of the great wars leave the world technologically broken and the survivors of mankind regress into the mid-1800s in a Cowboy/Victorian punk story about preserving the past and paving a better future. 

Or maybe my wild arms love letter of cowboys, swords and magic across a desert landscape with magic tied into native tradition, themes on natural protection vs scientific progress and lots of anime bullshit. 

Or hell, give me a sci-fi horror in the vein of Signalis. Give me Event Horizon meets Silent Hill meets a little bit of that dystopic energy in Dead Space.