Well, the way my mind works, is it comes up with 8 billion ideas all at once and then slowly works down to what really sticks. xD
To give a few ideas off the top of my head, though.
Super Sentai/Power Rangers team, either set in an alternate Power Rangers universe, or with a completely original lore.
A Star Wars rp based on the criminal underworld of Corruscant, focusing on criminals and bounty hunters and whatnot, with an absolute minimal amount of force-wielders, to help fill the gaping hole in my soul that was left when they canceled Star Wars 1313.
A Dragon Ball rp, set in an alternate timeline with a cast of original characters, taking the themes and style of the original.
A Persona rp, using a general plot I came up with a long time ago, just cause Persona is awesome.