Leah Day's Explore Walking Foot Quilting: My "Rainbow Log Cabin" Part 8

Sewing the design in a clock wise direction makes it much easier.

The square in the larger blue blocks.

Block 2 - 11 min
Block 3 - 12 min
Block 4 - 15 min

Now I need to decide how to fill the 3.25 inches that are in the four blocks...  I plan on using concentric squares as Leah did in her model Rainbow Log Cabin, it's just do I make them all the same?  and how much space in between the lines?