I had a slumber party for my daughter around that age, she is college age now...and I served pancakes and syrup and the kids loved it...the decorate pillowcases is a great idea...another idea I have heard of is a sort of resurrection of the joy of paper dolls...with some safety scissors...kids love to snip and glue...some girls I bet have never heard of paper dolls...
I found this link that has links to other sites that have paper dolls you can copy out on card stock plus clothes...
http://proudmommy.tripod.com/paperdolls.html