Nice, I did the same exact thing and it works excellent.

My room mate had an old foam sleeping pad that was just sitting around. We were in the dehydrating mode, and I realized I needed a pot cozy. Realizing my room mate had that unused sleeping pad and kindly asked if I could cut it up. He agreed and I made one for my Snow Peak 700. I used gorilla tape on the edges to keep it all together, which means it doesn't break down or anything...which further means its quite bulky carrying it around. I am trying to figure out a design to solve that problem. It would be nice to have it fold flat but I think that may be impossible....

Nice job though! DIY Projects are great.
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"To me, hammocking is relaxing, laying, swaying. A steady slow morphine drip without the risk of renal failure." - Dale Gribbel