While sitting at my table, between customers, panels and events, I do art for myself. Here are a couple examples, a Red Glowing Dragon, and "Awa' with the Fairies."
When I'm just doodling freehand original art like this, if you walk up with $50 cash, you'll be able to buy any sort of art like this, easy. So if you have ideas of what sort of doodles you'd like to see me doing, let me know. And because we all have Square, now, but it seldom works without 20 minutes trying to get connected, you bring your twenties, I'll bring my ones, and we'll do it the old-fashioned and easy way.
And you get publishing rights with any art you buy. This means you can share it any way you like, as long as you don't manipulate it or get money involved. Personal cards and postcards are fine, so long as you don't sell 'em.