Last year my school did a show called Bee hive the 60's Musical. It was a show with an all qirl cast. Guys can be in it but its up to you. But in the show are songs like respect, its my party, and the banana game. It is really bright and colorful. Good luck in deciding.
I was going to suggest Ruthless, also. It has about 8 characters, I believe.. with most of them double-cast in the second act.. all roles are female, except the role of the agent "Sylvia St. Croix" is usually played by a man.