I designed the front of the quilt by drawing the blocks out on graph paper. I haven't seen a quilt quite like this before, and now I know the reason. When every block is different, you have can't take any shortcuts with cutting. It was painfully slow and after I finished the first one I almost didn't do the same thing for the second.
For my youngest niece, I used green sashing and a lighter green polka dot backing:
The back of hers has 6 wonky paintbox blocks set off center. I loved how they turned out, and I'm definitely going to try this again. I used oh fransson's tutorial. It is for regular paintbox blocks, but it was easy to make them wonky at the trimming step.
The binding is leftover fabric from the blocks. I was astonished at how much fabric I still have left over!
My sister sent me a picture of my niece cuddled up in the quilt and I felt sooo proud and happy.