I did say I was up to something complicated. 😉
Twelve different colors of blue-green. *G*
Complicated as it looks – and yes, it does take concentration and a pattern to put together – I only have to deal with 4 colors, max, in any one row. So as long as I conscientiously pick up each color and put it away after I’ve finished with it, the chances of messing up the very close shades of color are minimized.