My 11 year old is TOTALLY into artsy stuff -- she loves those little sets like for friendship bracelets or t-shirts or whatever.
She doesn't do much in the way of toys anymore (except for Webkinz which is out if you don't know if this girl has a computer).
I agree about things like bubble bath, nail polish, lip gloss, hair accessories.
My daughter also loves the teen mags (think Tiger Beat) with all the posters that she can pull out and cover her walls with.