If you're more into creating, there are many new things to play around with, from jump pads, to A.I.-controllable characters called "Sock bots," to new logic circuits to allow you to make your switches and activated objects work in as complex a manner as you like, allowing for the creation of more elaborate puzzle-based gameplay. Why, I've even seen levels that were First Person Shooter and even Pinball games.
And, for more creative expression, why not make your own music for your levels with the new sequencer tool? For that matter, with the new in-game level connection gate, you can connect your levels into whole games. If you think you know what can be built in LittleBigPlanet, it's "Back to School" time - and your major? Recess.