It's time for some downright fun with the girls!
You can go thrift shop hunting to get funky hats, wigs ,weird clothing, costumes and accessories, buy fake eye lashes, lots of glitter and cheap make up for wacky makeovers.
A karaoke machine would be great fun if you have one or if you can rent one.
You can do a little craft project -- decorating night T-shirts (you can color a white T-shirt with fabric paint, markers etc. and have everyone to sign or write something on each others T-shirt) or decorate glamorous eye masks.
You can set-up a little treasure hunt (have a little goodie bag for each guest to find with items like bath salts, massage oils, relaxing aroma candles , soaps, bath bubbles etc.)
Don't forget to have disposable cameras and a video camera around to capture the fun moments.