You don't need an art show for a reason to send out mail art; you just need a willing partner who lives at a different address. (Or, I suppose you could mail something to your child, and your child to you, if you drop off the art at a mailbox... just make and mail it secretly, so your recipient will be surprised.) Now that almost all correspondence is done online, it is truly a thrill to get something nice (not a bill, not junk) in the mail. Pick a cousin or an aunt or a camp friend, and say you'll send them art if they'll send you some back. It's a visuals-based version of a pen pal. An art pal! I know I find it easier to draw or paint something than write a small-talky letter.