Naomi asked in comments:
In the small section, I saw illusory ‘circles’ of pink that don’t seem to be visible in the larger area–is this an aspect of the design or just something I’m imagining?
When I look at the photos I see some large squares on point. They seem to be 3 or 5 squares on a side and are formed by the on-point “square in a square” of the small blocks. Most of those edges seem to be formed more with the contrast of a light center area of the blocks against the dark outermost triangles. Areas that don’t pop out this way are more muddy contrast wise.
Interestingly, (perhaps!) the stars that I saw in my drawn and early mock-up versions don’t seem to pop out at all.
I’m not purposefully placing color except to keep a lot of a single print from ending up in one place.
Before I started I made three piles of each color block – designated light, medium, dark. Light v dark was pretty easy, medium was not so clear. Both colors had similar amounts in each of the three piles, which I thought was interesting. There are fewer fabrics involved in the greens than in the pinks.
My main thought in placing them really is to make some areas that are appear to be lighted areas and some areas that seem shadowy with of course areas that are neither. Right now I am alternating blocks based on whether they have red or green outer triangles. I figured start out this way and then re-arrange if I didn’t like it. The finished configuration is supposed to be 14 X 20-22 blocks.