My dd turned 12 and had a sleepover. I bought cheap plastic cups and paint pens and all the kids made "party cups" (they used these cups the entire time.) I also found some little wood picture frames that came with color pens at Michaels crafts store. They were $1 each. I bought each girl two. I got a fruit tray from Whole Foods (cause that is what they wanted.) Dh took pics of all the girls together, with dd, etc and printed them out. For 3 hours they sat around with a movie on, painted their cups and frames, ate, talked and had a ball! It was the most stress free party in years.
Oh and someone brought the game "Twilight, Scene it" and they played that for a while.