I attend a craft meetup (Glasgow Craftaholics) every month and since February we have been doing an ATC swap.I hadn't heard of ATC (Artist Trading Card) before the first swap and since then I have been hooked.
If you have no idea what I am talking about an ATC is a 2.5" x 3.5" piece of card on which you decorate, a bit like a card topper. These cards are then swapped for other crafter's ATCs. Swaps can have a theme whether its the technique you are using, colour or subject. There are lots of websites that can give you more details but I find the Go Make Something has the best description and of course Pinterest always has lot of inspiration.
I sometimes find it a bit daunting if when I sit down to craft and I have a 6" x 6" piece of card in front of me. It's a big area to fill especially if you are trying a new technique. However, with an ATC the area is just big enough to try someting out without being huge. They are also a lot easier to transport if you want to take some crafty bits to do while you are not at home.
If I have won you over to giving them a go and do not have a crafty community to swap you cards with there are lots of blogs and forums that run swaps. I have taken part in the ones on the Trimcraft and the Docrafts formus. Everyone is really friendly so join up and have a go!