I've been trying to figure it out, but I'm worried I'll go to kiddish. I need some ideas, if anyone has any, for a girly prom/grad cake. I was thinking on a bed of flowers to have a diploma and a crown with 2010 written on it, but is that too childish? I don't remember what it was like when I graduated. hehe.

im only 18 so i can help
bold colors are good stay away from pastels that makes it kiddish. maybe a zebra print? crown and diploma and 2010 is all good. a bed of flowers might be a little much but a few scattered would be cute especially if you dusted the edges to match your color scheme

Here's a cutie; not to kiddish and it has flowers that are not to bright but not pastel either. Michaels has the daisy cutter set for $2.97 (well in my Michaels it is).

http://www.cakecentral.com/cake-photo_1704403.html