Hmm a little background info would have helped but...
Can you do any fast single-stroke rolls?
Running a single-stroke roll across your snare then tom then another tom then floor tom- or any variation of that a la Keith Moon- is great for impressing some people, but only at reasonably fast tempos
work on left hand right hand balance to perfection.
Learning rudiments is probably the best thing to show other people up- just knowing grooves and simple fills may not always hold up you know.
Youtube and expertvillage.com have lots of videos on rudiments.
There is always the tried and true method, just buy a double-kick bass drum pedal, and show off your foot speed- always a winner.
That said blast beats-if metal is your thing- are really intimidating in the right situation as well.
Try them all, or at least have a google into each one and see which one would suit your playing style- the world of impressive drumming is a broad one.