Coloring books for little ones are a great place. The pictures are large without much detail. And not sure if you are asking for this or not, but to make stencils to use, I take the lids off of 2 gallon plastic icecream buckets, or the lids from butter tubs and whip cream tubs. They are easy to cut with kitchen scissors or a utility knife. I have thought about using an laundry soap bottle too, but havent given that a try yet.