A rope bracelet - reminds me of making friendship bracelets back in the day. My right second toe used to go numb because I'd hook the end of the bracelet over it, and then knot embroidery floss for HOURS.
Bottle Bank via Martha Stewart: transform a used plastic bottle into a cute piggy bank. Could use same idea to made little containers for kids to store their collections too (use bottle with wider opening and don't make slot)
Option Use I second piece of same bottle, make a pincushion on one end ( glue gun a ribbon to cover the raw edge) and the zipper for a sewing kit! Two plastic bottles and a zipper, nice small gift holder.