I recently joined a new swap on http://www.crafttelly.com/forum/.
We decided to try our hands at making an A7 card - it's a bit bigger than an ATC. I've always struggled with ATCs but thought I'd have a go.
The backing paper was free from a magazine. I stamped the image and watercoloured it using Derwent pencils. I enjoy watercolouring, why I don't do more I don't know!