Time to use the painted fabric.
The fabric I painted was a very tight weave Pima cotton. It's beautiful to dye but not fun to hand sew.
However it allowed me to cut strong strips 1/8 wide and narrower. The cutting was at right angles to the lines of colour. This gives every piece a "birch feel" with bits of black and grey and orange.
In the end I decided to stitch ALL the little slivers down. I used a blind stitch and invisible thread. In the close up the holes from my needle show but that's unimportant, they will disappear under other layers. This will take awhile.....LOL