Could save the "topper" of every birthday cake growing up or favorite "happy meal" toys. Totally cute idea to do something with all those small sentimental kid toys that you don't want to get rid of and then hang it in the playroom :)
This would make a great christmas ornament after the wedding. I would use leftover bling we had from the table scatter inside. Rhinestone Monogram Christmas by PaperPrincessStudios on Etsy - How about wedding favors?