Home Hair Salon
Set up a home hair salon in your bathroom or living room. Put a comfortable chair in front of a large mirror and place a variety of hair styling tools on a table beside it. These might include curling irons, hair dryers, clips, feathers and hair bands. Now start styling the hair in the craziest style you can think of. If you're holding a slumber party, get some of the girls to do makeup while others do the nails and work on the hairstyle. For extra fun, blindfold the girl whose being worked on.
Online Games
You'll find a wide variety of free online hair styling games. Free games sites such as girlybox.com and Freehairdressergames.com have a variety of games that are easy to play. In one game, called Hair Mania, you play a hairdresser who has to make each customer's hair as big as possible. To add an extra challenge, there is a time limit that you have to beat. Another game, called Extreme Hairstyle, has you working in a hair salon where all the clients want dreadlocks, Mohawks and bright colors. Your job is to create the craziest styles possible in the least amount of time.
Hair Fashion Parade
Once your girls have given each other crazy hairstyles, hold a fashion parade so they can show them off. Set up an area in the middle of your backyard or living room with either a colored carpet or a miniature stage. Get the audience members to hold torches and play some rocking music. Each girl can pick her own outfit and must walk down the stage to the music. The audience members can write their score on a big cardboard card and the highest rated girl gets a special prize.
Dress Up Dad
If there are any men in the house -- dads, brothers or uncles -- ask them if they'd be willing to sport a wig. Grab some cheap wigs from the local fancy dress shop and get each of the men in your house to wear a wig for the day. It's simple but it will absolutely thrill your little girls, especially if you convince the boys to go outside wearing them.