L.C.
Sassy parties are big. Do the dress up tea theme with the mani pedi. If you don't have a girly girl you could also do a tie die Tshirt party. Just get the puffy paints and add water super easy keeps them entertained. If you want to really go out they could make friendship bracelets to take home too. I suppose you could from 80's grateful dead to now 2000 earth day themed :)