I went through a what I would call a mandala madness phase not so long ago, every page of my sketch book was being attacked with a compass and ruler, a few pencil lines followed by few hours each with pens. As well as being very peaceful and meditative to create mandalas it also allows you to explore and improve your drafting skills and penmanship in the process. The best thing is that you never quite know how your mandala will turn out in the end. Despite laying down similar pencil foundations in the beginning, the outcomes seem to be dramatically different.
So here's what one week of 'Mandala Madness' looks like: