You can reinforce some previously taught vocabulary whilst they make something that they can take home and proudly show their parents. Parents also can have some insight what topic you are on in your ESL class.
So at the zoo animals topic one of the things, your young kids can make, is this paper plate tiger.
What you will need:
Old newspapers (to cover the tables)
Orange and black paint
green platicine for the eyes (optional)
Have fun!!! :)