I have darned so many pair of socks as a kid I can't begin to count them. I made sure to have good darning thread and a nice large needle to put through the sock or blanket to be darned. I would use a large glass to frame the piece and then circle around the area with my threaded needle. It is a matter of doing a weaving process this is where it can get artful. Mostly I was using white or black and just weaving because the socks were either white or black. If I were darning something like a sleeve I would alternate colors sometimes. Mostly very plain work though.