School of the Wild maybe? Leaf rubbings are a good excuse to go outside, but you can't always find dropped leaves all year round! Use a laminator and a metal ring to create leaf rubbing plates that can be used all year long, over and over again!
Great for kids! Reusable checklists, every Saturday morning each kid gets a room. -I have been working on a check list for each room like this for awhile now. might have it done by the time my boys are old enough to help clean!