I've heard of them but didn't really know what they were so I Googled them. I discovered that they have a website with all kinds of games and downloads and stuff for kids to do. The site includes colouring pages - you could print these out and have a contest for the best creation. Have crayons, glitter, etc. handy and let them create!

You could also have a "makeover" session with cheap cheap lipsticks, glitters, eyeshadows, etc. (and a bunch of wipes to wash their faces afterwards!)

We did this last year for my daughter - we bought some Bratz tattoos, and decorated the house with Bratz posters. When the girls arrived we put on a tattoo on some while others were topping their own little pizzas then we swapped round. They danced to Bratz music and we drank pretend champagne (apple juice & lemonade) from plastic champagne glasses (cheap from garden centre). They had a fab time - hardest part was putting together the party bag but Ebay was good for cheap fillers