Kody (he colored all his green) and Jack's (all his are yellow) aquarium out of a diaper box with crabs that they said look like spiders, "They need pinchers!" they told me. Oh well, that was as creative as I felt like getting at the time with two 5 year olds, two 3 year olds, and Trestin (13 1/2 months old) all running around crazy!
Then the highlight of school for the kids I think was playing with playdough at the end. They had a BLAST!