I chose the sentiment from "Friends to the End," which was the stamp of the month for October 2011. I haven't yet chosen to do SOTM because I try to watch what I spend and only buy stamps once in a while nowadays. The 2-year anniversary is definitely a good reason to though!
The funny thing is that the entire time I was making it, I kept saying to Howard, "I don't like sketch challenges!" and when I finished I actually said, "Hmm, I actually like it!"