Activity for Allison

I really wanna do something really cute and nice for wedding favors, but I have no idea what to do. I'm having 150 guests and my colors are different shades of purple and green. I do not want to spend a crazy amount of money, but I do not want them...

I have BM's that are very different in shape and size... Is it tacky to have them all ear the same color short dress, but possibly different styles?? I'm in need of suggestions??