I like this idea, but would try to extend the water theme. Put plastic fish inside with a gift card to Bass Pro Shops! A gift card to the pool store or local water park would be fun too. I'm all about making the gift card connect.
Paper Bow Template for some super easy gift wrapper crafting, or you could use this same template on some ribbon and make bows to go on ornaments to give to your big or little! Make out of ribbon for a little girls bow.