How much money are you hoping to make?
I really dislike a bunch of small fundraisers...it's like salt on a wound to me. LOL Our last school did a big dinner dance, silent and live auction every year and it brought it hundreds of thousands of dollars. So that's large scale and it's a TON of work. But there were no other fundraisers throughout the year, which was great.
Smaller scale, our preschool used to do a 'Kids Sale' every year in May, and it brought in $4 to $5K each year. Everybody would donate their gently used items and it would all get sorted out, cleaned up and sold really cheaply. One year we priced all clothing at $1...didn't matter what it was...it was all $1. It does take volunteers to take in the donations, sort everything, clean toy items etc and you need a large room to store everything, plus a place to have the sale.
Another small one that my neices preschool does is cookie dough. I always buy a TON! LOL! It's preportioned cookie dough in about 6 available flavors. You get 4 dozen little cookie dough balls for $12. They're great - it's so easy to just cook 4 cookies or 2 dozen! There are a couple of different companies that offer it...
Main Street Gourmet
Then there are always all the usual suspects - Entertainment Books, Plant Sales, Bake Sales, Popcorn, Candy etc