Redo boring barrettes with bows, beads and little trinkets.
Cover a large surface with newspaper and spread out all of the items. Then cut a piece of poster board that is slightly larger than your barrette back.
Once you've finished the design, carefully push aside the materials and cover the pattern with glue. Press the collage items on the glue and allow to dry completely.
To finish, hot-glue the poster board to the barrette (a parent's job).