The "Frankenstein" approach is a time-honored tradition. Nobody has to care but you. I went looking for add-on drums on Reverb, and all I found was a 16" floor tom. What size do you want to add?

I also went looking for wrap that might match. I struck out on actual drum wrap from the usual suppliers, but I did find this stuff on Amazon. It's car wrap in a color that's close, and the link is to a 4"x8" sample of it for three bucks. It would be worth a $3 gamble to see if the stuff matches your kit.

You can always wrap an extra drum to match the ones you already have, if you can find the material, and that material doesn't necessarily have to be purpose-built drum wrap.