1602 Spidey, 2099 Spidey, Peter Porker...all of them. As inspired by the Shattered Dimensions video game.
Sony, Sony, pay attention - this is one spin-off movie I would actually pay to see. Get Spike Jonze to direct, and have it be the sequel to Being John Malkovich, with Peter Parker disappearing inside his own head (or, given the way Andrew Garfield plays him, up his own ass).
Who's with me?