I always liked splitting the entire kit to a group (or dupe the drum tracks), crush the hell out of it, and then mix it back into the natural drums. That will give you that extra presence and punch.
I've also heard (and I'm dying to try it) that you can get some cool sounds sending a group out to a Big Muff and mixing it in with the dry signal.
There's also key inputing a gate with white noise for a snare drum will give you more of a firecracker sound.
-edit. oh and keying in a 50Hz tone in for your bass drum. [rumble]
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