#1- different parts of your hands make different sounds.... use this
#2- stay away from drumset rhythms (ie. bass sounding where Set hits kick, and high slap where snare hits) This one is harder than it sounds (well, for me anyway) because you're so used to playing and hearing drumset rhythms. Not to say you should never do this, but percussion is to add to the drumset, not copy it.
#3- Djembes are really really cool for deep thunderous subatomic bass sounds.
#4- Djembes are also cool for really high slap sounds.
#5- clay drums make cool sounds (kinda like balooomp)
#6- different sticks/brishes/mallets make different sounds
#7- don't try to write out parts, improvise them--- more fun, and you'll get more creative parts and a better feel.
now, for basics of actually playing.
here's an overview for the basic sounds of congas:
bass tone- put your hand flat against the drum, and then bend your fingers up. that's the shape your hand should be in. Hit it with your palm in the very center.
open tone- put your hand flat against the drum again. Now bend your knuckels up so it makes an angle between your palm and your fingers like 135degrees or so. Hit it with the fleshy part of your fingers.
high slap- start with your flat hand again. and keep your thumb kinda away from your hand. And just slap the drum near the edge.
those are the 3 basic ones you'll use, Of course there's other ways you can hit to get other sounds. Some things I do are scratch it with your nails, knock on it, pound it with your fist.
well, that's all I can think of for now. I'll probably add more later.
if there's anything else, just ask