This was a lovely swap recently at UKATC and something very different.
Take a 9 pocket (each one 3.5" x 2.5") plastic sleeve used for collectible cards and fill each pocket with an ATC and some little treats. These could be die cuts, postage stamps, mini pictures or anything that will fit in the pocket. Both sides of the cards need to be decorated but the great thing is the sleeve can be rolled to fit a stand DL envelope.
I received a lovely Pocket Letter from my swap partner and had great fun finding the little treats. I had as much fun putting mine together and here's a picture of the front ...
... and the back.
There are quite a few YouTube videos about these if you're interested.
See you soon.