I actually often start my fly tying in the slammer. Not starting it. But plans for a pattern starts in the toilet while taking a break from the family. Excited one rumbles out with pants around the knee and sketch the idea on the first piece of paper and put it in a box together with the fly tying equip. Im not much of a sketcher, but I’m great at enjoying the bathroom and the ideas gets on that piece of paper for reminders.