When I started rubber stamping a million years ago, the only thing I stamped was envelopes, mostly to my sister-in-law, Sheri. Sheri and I sent letters back and forth regularly for quite a few years. It didn't much matter what the letters had in them, it was all about the envelopes. No envelope should go into the mail naked.
Lately there has been a discussion on Facebook among some of my friends about mail art. There are formal definitions of what constitutes "real" mail art, but for me it is just decorating envelopes. Today I actually went into my art room and played with scissors and glue. I haven't done that since before the holidays, so it is a start.
It felt good to play, even if the play was simple and basically meaningless.