Cassette Tape Christmas Cards

When I first moved to Philly in November 2010, I was hopelessly unemployed for a long while. This left me lots of spare time to make some detailed Christmas/holiday cards. Unfortunately I didn't  take pictures of all of them before I mailed them throughout the U.S. but there was roughly 20 of them (some were cassette tapes, some were cassette tape boxes) and they looked something like this:

 And there were lots of them: