It took awhile, but using the scanner on my inexpensive printer and Paint, this was the design I came up with. It's very simple, cartoony, and childlike and that's the vibe I was wanting. The Muppets have never been about class and looking good.
The t-shirt people wanted a second background for each shirt, so this was the background color I chose for that option.
Unfortunately, my T-shirt didn't even get the opportunity to be voted on. There was a deadline for the contest and I did get my entry in about three days before that deadline. However, a day after submitting my entry, I received an email informing me that my design wasn't even going to be put up for a vote because it didn't look "professional" enough and was too amateur.
I didn't have the tools, time, or capability of submitting something that was more professional and refined, so I didn't get to submit an entry.