I would check pinterest.com out. Just type in "barn quilts" and there are literally thousands. I have made some and my favorite one is the Dresden plate and the tumbling blocks, the folded star (Americana) and the Maple Leaf.
I would let him use your rolling pin. Just use parchment paper over the clay and it will not get on the rolling pin.
I have 8 boards ready to paint and I want to do the Grandmother's flower garden, more Maple Leaf, and the Double Aster. Have fun and be sure to get him to sign and date it for you.