Every day from Monday to Friday I'll pick one piece in my shop which will be priced at $0.50 - yep, 50 cents. I'll tweet it and blog it. And the first person who finds it can buy it for 50 cents plus shipping.
You could say, hey, Michele, that's not free, and I would understand that, but this way I can make the freebies (super-cheapies?) available internationally. (And seriously, if you don't think my artwork is worth the cost of postage plus 50 cents, leave it for someone who does.)
I'll select a mix of different types of artwork and big and small pieces. And if you don't wind up with any free art, well, hugs and lolcats are still available at no charge.
Just one more thing: honor system. If you get a free painting, be nice and leave the rest for others, or you will make me sad.