I decided it's time to quit messing around and make something in stranded color work. I found this Color Knit Bag Knitting Pattern
that calls for acrylic yarn and I can use odds and ends I have hanging around. It's knit flat per the pattern but I'm doing it in the round to avoid side seams. I eliminated the first stitch in the chart as it isn't repeated and I can't see any reason I need it. The stitch repeats are working out just fine so it must be OK. My photo shows how I started out. I used a provisional cast on so I can do a 3-needle bind off and skip the bottom seam as well. The funny mixed colors are the cotton yarn I used for the PCO and the blue yarn is actually lavender. It seems to take surprisingly little of each color so it looks like a good stash buster too. I could start one with whatever color and just pick out the next one as I come to it.
I can now take pictures for posting much more easily so I had to try it out. The color is all washed out I think partly because I wasn't careful to pay attention to lighting. I'll hopefully do better when I post an update.
Thanks for looking!