welllllllllllll. .... .. . . ... .
heres what The Truth has to say.......
first of all, do not hesitate to experiment with your sounds. speed up snares and thin them out with eq to make new hi hats.... layering s always a good thing, but they will still sound plain if all you are doing is fattening things up and filling space with echos and reverb ( this isnt a knock on vitaminman's suggestion- i'm just saying that you should use the effects as an accent to your track, not as a mask for the drum sections shortcomings...) use various percussion sounds, the tamborine was a good start, but there shakers, triangles, etc., and there are different types of these sounds...
try and throw rolls on the snares.. do study live drummers! experiment with different time signatures, things like that. remember that you do have cymbols and crashes as well....
the other thing to remember is that the instrumentation you use will often determine how your drum section winds up in the end. somtimes, once you have added your instruments along with the bass, you will end up stripping down the drum track to create a better compliment to the rest of the song. remember, less can be more at times; dont assume that every song has to be complex, because that just isnt the case.
what i do many times i start out with the dirtier, more "underground" oriented kicks and snares as the foundation of the track, so it's like this:
boom-chick-b-boom-chick-boom-chick... just basic to start, but then i will use the hats on another midi track to do the open-and-close thing, with an acoustic snare sample behind the original snare, and add whatever percussion sound i want- claves, tringle, whatever, at lower levels then the rest. i will use the acoustic sample at very low levels for rolls and just fills here and there.....
also keep in mind the depth that stereo will add to the mix. say your synth snare is panned 10 to the left, you could put the acoustic snare at 20 to the right and make the reverb on the acousitic sweep hard to the left.... things like that. anyhow, this was my two cents, i hope it was of some value to you.