We’ve never tried lunch notes, but I think they look like sooo much fun! What a nice way to remind your children how much you care.
These free fruit-inspired downloads are available at Alpha Mom. They are easily made with office supplies you probably have around the house.
Disney has lots of fun downloads available here. One of the things I like about the options they offer is that there is something for all ages, from your preschooler to your tween.
Family Fun has some great lunch box jokes here.
There were lots of cutesy animal lunch notes. You can find some here, here and here
Obviously, there are lots of fun options available on the Web both for purchase and for free, but they are not really necessary. In the long run, your child will remember a handwritten not on a post-it just as well!