I like the idea of having the caterpillar number line in the classroom, especially a toddler or preschool classroom. This is something children will find interesting and want to learn more about it.
My idea - Each child decorate a hand and attach it to the big tree. (Make paper hand cutouts from your children's hands. Write things they are thankful for on the hands and you will build your own thankful tree!
IKEA Paper Organizer - Craft Room - DIY Paper Sorter from stacked IKEA Magazine files. Just tape together with packing tape.