If drawings count, the card I recently made for my uncle, who is also my godfather, is definitely my favorite. It's a drawing of my brother and I saying, "We have an offer you can't refuse."
I thought it was adorable.
If you meant actually build something, the hotplate I made a while back is my favorite. I remember being told we were going to make one and thought, "Why?" And now, I use it at least 3 times a week.
