These postcards are just 4 x 4 inches big and could be mailed as postcards. I rather tuck one in as the special something to a holiday card or birthday card. They fit in a standard size A2 envelope.
Perhabs you will find one in yours!
This one is 4 x 6 inches and I had made it a while ago, but finally finished it up with the other ones.
I do try to finish one of my UFOs before I can start something new, but if I just want to try out something new it sometimes can't wait and has to be done right away.