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"Hula hoop, sheets and ribbons. Why did I never think of using a hula hoop to make forts?" - Ooh! This could be like having your very own portable changing room for when you go to the beach and they don't have bathrooms and you don't want to get the car all sandy. Just tie it up to the nearest tree/pole/object and presto!
Kids play tent. this comes from a lengthy tutorial, but could use bed sheet or fabric and hula hoop. hang sheet, insert hula hoop where desired, mark spot where hula hoop goes, sew/glue hula holding strips (velcro if removable), some way for hanging tent, add some accessories, etc....