Have you ever not used something just because it wasn't readily at hand?
This is what happened to me when I purchased a Cricut machine (not for scrapbooking) and the co-ordinating markers and deep cut housing. I knew this would continue unless I got more organized but didn't tuck them all away in another plastic tote that I couldn't be bothered to dig through when inspiration hit.
Firstly, I started with some sheets of Lexan, Vivak or Mylar - I ordered the Lexan for my dollhouse windows since it is fairly scratch resistant and added a few other items to sample.
I didn't realize that I chose the opaque code and this is how I ended up looking for something to use it on. Really any polycarbonate will work fine if you have enough surface area for the quantity of markers you have.
Next I gathered a square, a acrylic sheet cutting blade (not shown), my ever trusty Xacto blade and a set of circle templates. I used the template because it's easier to eyeball the placement of the second set of circles AND I could actually poke the marker through it to test fit.
Can't do that with a compass.