I did this and it was really fun, it got a lot of people looking.
You will need people for this costume idea. First get some material that looks like a zebra design. For Fred, stuff pillows in the costume to make him look big. If you have dark hair and you need your hair blonde for Barney, buy a wig and cut it short. For extra fun, make a car out of a piece of cardboard. All of you get in it and run like they do on the Flintstones. Have fun
Thanks to ~ME~ for this great idea.