I'm a junior in high school, and my school seems to be pretty odd.. We don't really have cliques. Sure, the band kids hang out together, the stoners hang out together and the atheletes hang out together, but all of those groups are entertwined with each other. I'm a total band kid (hang out in the band room with whoever is in there at the time, when I have spare time at school), but I am friends with a lot of 'skaters/ BMXers', 'stoners', nerds' and a large amount of the athletic crowd (and pretty much any other stereotype we might give people) as well. A lot of people in my school are this way.
Btw, bullying is not a big problem at my school either.