Matt built a small Flash tool for his personal use where he could control the radius and rotation speeds of 3 circles, each sitting within the other. He could then specify the line thickness and colours used in the code and once happy with the the values, hitting play would create the animation. When the animation is finished, Matt saves the designs as a PDF using the print functionality, outputting a vector file which could then be printed at a large scale. Peter then chose 3 designs to work with resulting in the stiched designs you can see below. More outputs can been viewed here.
Matt plans to creating large prints of the other designs and possibly turning it into an iPad app.