When it's zendala challenge time, I create a page with two small zendala's (90 x 90 mm) and a large one about 160mm square, to fit underneath the two small ones. This way I can use either one to work on, and still have a spare to do at a later date. I print them out onto a lightweight card which I find takes the micron pen quite well. Today I decided to do a small one so I could complete it tonight, so here we are!!