Wow! Look at you guys go. I ended up doing more playing with fabric in the sewing room than actually sewing because I didn't have my extra neutral rectangles cut and I'm a tiny bit short of my white -- like 1-2" is all but that can be a lot in this case.
For years I've used Kona Cottons because of their dye standards but I decided a couple years ago to switch to AMB (American Made Brand) by Clothworks. I'm sure I've gotten it at Joann before but they seem to have reduced brands (and increased the Kona they carry) -- most people don't want or need to choose between 6 different pure whites, but I like to keep consistent. Anyway, more is on order and coming this next week. Here's a video on the product/company:
https://www.youtube.com/watch?v=-NQiAGfH05o
I'm going to play with my blocks and aqua equivalents while I'm waiting, will probably take me that long to decide.