As promised, here are the 4 pieces of mail art I made last weekend. I have found I like to keep things fairly symmetrical. I guess that's what works for me. Looking forward to some free time so that I can do some more of these again (one day).
I used clear decoupage finish on a couple of them (the bottom two). I used the finish as a glue and also as a topcoat. The top two cards I used a regular glue stick. I recycled heavier weight cards to be used as postcards as the base for all of them.