I decided I would try a new to me technique, and make a shadow on each block. I have seen it done, but not tried it yet. I chose to use strips that were 1.5". The only "struggle" I really had is that most of the blocks were different sizes, so I had to do a lot of measuring to make sure the black was the right size.
Next time all the blocks will be the same width & length.
I LOVE my design wall. And it helped me so much when making this quilt. I was able to put the blocks up as I worked on them, but also be able to rearrange them so they were in a design pattern that I liked.