I taught everyone how to make six-pointed snowflakes, and we made everything out of computer paper and strung it up on floss (the only string we could get at the CVS downtown).
They turned out beautifully, and everyone had so much fun making them.
(top left is one of mine)
(mine is the middle one)
(I made the tiny middle one... I like little snowflakes!)
Paper snowflakes would make great decorations for a winter wedding reception too. They're easy, fast, cheap, and fun to make, and if you iron them out to make them flat (setting your iron on low with no steam, of course), they'll look professional (as they were, my coworker thought we bought them somewhere!). I like six-pointed ones because they're scientifically accurate and I'm a huge, huge nerd. :) But you could make othernumber-pointed ones too. I'm sure there are tutorials around online!