check out www.drummerworld.com and watch some vids of the greats on there. see if you can emulate any of their fills and licks into different styles of music. after a while youll use them automatically and be able to add your own style into them. fills are really where the drummer can add his or her part to the song, like a guitar solo. neways check that out and see if you can get anythin out of it. its alwyas gd if you can emulate things like that by yourself, withou having to use a peace of music. altho that can help you sight read, it cant enable you to figure things out for yourself, which is always a handy attribute.
hope that helps
i borrowed my favorite fill from Gavin Harrison and tweaked it a little bit.
it consists of quads with left hand (on snare), and on every first hit, accenting the toms in an ascending order (low to high) with the right. also on every first beat, splash the high-hat with your foot and play the bass drum with the other.
Snare - RRRR RRRR RRRR
Tom - L L L
Hi-hat - L L L
Kick - R R R