Loved teaching this tiny 4x4 Butterfly Post Card with matching envelope yesterday at the Eternal Maker in Chichester. I especially love the matching envelopes made from a 6x12 piece of paper. Simply find a smallish envelope, carefully undo all the seams and make yourself a template. Just be careful not to go too big, as it could then take a whole sheet of 12x12 paper which might make the envelope a bit expensive. If you are worried about the envelope going in the post, there's no reason why you can't simply write on a plain ol' white envelope and pop your beautiful one inside. They would also make great secret journalling pockets for your albums and layouts.