Heeey, they make heroin in chewable form now???
Wouldn't that be cool? I can just see it... cross between
Trainspotting and the school playground. Maybe Nickelodeon can make a dumb TV show based on it.

EDIT: Just remembered- out here it wouldn't change much, anyway. I'm damn POSITIVE I saw one of those little rats shooting up under the slide the other day. And they wouldn't even share...
Anyway. If you don't have easy access to high explosives, pitchblende, or industrial quantities of blood, your best bet is to think like a performance artist. You know those little tripod things they put in the centers of pizzas? One of your classmates, no matter what high school you go to, will work at a pizza place. Get him to get 500 of those babies, and lay them upside-down over the entire front lawn. TH=hat sort of thing.
That, or declare the school building an independent Communist nation, and recruit your class to fortify it. If the UN refuses to admit you, embargo the leading nations and declare war on Russia, claiming that they are backsliders. Draft a constitution declaring yourself Premier or Dictator-For-Life, whichever title suits, and be sure to have an entourage of your more loyal friends about at all times. If you can get crops to grow on the land you have, put the middle-schoolers to work- otherwise, liberate the nearest supermarket. It's not likely you'll be able to get nuclear capabilities on the scale you'll have, but keep an eye out for any kid who catches a cold- schools are great for developing bioweapons. On a regular basis, conduct purges of those seditionists who secretly or overtly support a return to capitalism, execute a few as a warning, and exile the rest to the janitor's closet for life- feeding them is optional.
Keep in mind that little kids make ideal cannon fodder, if it comes to a government showdown, and that as a last resort you can light them on fire and launch them at hostile forces via catapult.