Munchkin and I made some cards. He drew. I supervised. (read: stopped him from eating the pens or drawing on anything other than the piece of cardboard, helped take lids off and put them back on, and verbally encouraged lots of drawing - I must admit to having a definite goal in mind!)
Then I cut out little squares from his drawing, popped them onto cardboard, and wha-lah! A whole bunch of thank you cards.
I think they look quite cute, don't you?