These are 1950s/60s souvenir postcard hot pads, made of layers of cardboard with a postcard image on the top. They usually come in sets of three, one large, medium and small. I recently came across two different sets, one of the Wisconsin Dells and the other Tombstone Arizona. Since I've never been to either place I don't really have any reason to keep them, so you can buy them (with your special bloggy friend 25% off discount code: PIT25OFF) from me right now.
The Wisconsin Dells:
Tombstone, Arizona. These would be great Halloween decorations as well!
Love the 'Tombstone Epitaph'!
And the back. These table mats Insure Your Table Finish (even if it's Formica! ;)