Good news, happy dance! I had to check this morning and found those plastic canvas circles are large enough to fit ALL the circle Nestabilities!! Here it is placed over the largest die! It fits the Scalloped Circles as well, and you can choose a track to pierce rings inside to make a border or outside your die cut to frame it! wheeee!
and look! They also fit your Coluzzle templates, woohoo!!!!!!!!! (This is the larger of the Coluzzle circle templates)
Okay, off to design some full cards with some "piercing sketches" I was dreaming about last night, please check back for pics! :)