I could not resist this idea that is all over Pinterest and came from this blog. I used Skittles and M&M's to get all six colors of the rainbow and made tiny tags to tie to each bag. One of these went off to my niece and seven year old sister (along with the shamrock necklace kits) and the other three will go to my sister's kids. She will likely be less than thrilled with me for giving them all this candy, but it's just too cute not to.
If you also want to overload the kids in your life with sugar here is a copy of the tag I put together...Download Rainbow Tag.