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Ask everyone to come dressed as fairies! This gets the girls involved in the party, and also lends to the magic and look of the party! Serve tiny food to your fairies. And have them decorate a star wand (cut star shapes from thin wood or poster board. Glue to a length of dowel and spray-paint gold. The girls can decorate their own wand with glitter-glue, stickers and foil confetti. Or you could have them ready before the party.) If it's within your budget you could also drape an entire "fairy grotto" with tulle, or if not, try hanging balloons and sparkly stars from the ceiling with shiny ribbons (make use of your local dollar store for these things!).
(Some of this idea is courtesy of Petra our own scrapbook-tips guru).