I was considering a type of block that, when you jump on it, it bounces you up (possibly an additional block for each bounce up to possibly three to four times the normal jump height). I was just hopping around in Minecraft when I recalled the blue gel back in Portal 2. It would m,ake for some very interesting traps, pits, and means of getting up to high places. It'd also be great for those adventure-type puzzle maps where you have to cross a pit of lava.
It could possibly be a block of rubber or something, or possibly a new type of pressure-plate piston that sends you flying.
Come to think of it, it'd be great if you could put pressure plates on pistons to create simple, small, and compact elevators. I haven't though the second idea through at all, but what the Hell. Worth mentioning I think.
If you like the idea of bouncing around, check out the More Pistons Mod. It has this cool things called gravity pistons, which, when facing upward, can launch gravity affected blocks and mobs about 20 blocks into the air. But that's probably too overpowered for your liking. It did look pretty cool though when Yogscast made an iron golem bouncy castle with them and pressure plates.
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