My knitting colleague E. made the (arguably) goofy decision to refresh her crocheting skills by taking on a granny squares blanket. It’s a great idea for using up a ton of scrap yarn. It’s not a great idea if you enjoyed the level of sanity you had when you started. She quickly ran into the classic self-randomizing problem: given 20 different colored yarns of different weights, how do you put 3 different ones in each square while trying to keep the colors as random as possible? Sounds easy enough, but after 15 or so squares, it gets tricky. If you’re aiming for randomization, the last thing you want is a…