I've been holding 5 for $5 Classes since mid 2007 and it's fun to go through and see what I've designed from the same time the year or two before. It's kind of like looking through old family photographs and seeing your evolving clothing and/or hairstyle choices only most of the card pictures are a little easier to look at!
I've learned a lot about what my customers like and dislike and what makes my job easier. I've also learned to trust my first impression of my creations. If I like them, then most of the time the class participants will too.