I'm running a feudal japan campaign with cthulhu influences using RMFRP, Call of Cthulhu, and the Sengoku Rpg, and I have also created, and playtested, a post-apocalypse world using a mix of RMFRP and SM:P, with inspiration from various post apoc games like Aftermath, Pos-apocalyptic Hero, and such...
I'm working on ideas with playing a Cthulhu/Dreamlands/Pirate scenario using RMFRP and Pulp.
/ninja