I just found it on the board-- a photo of it-- and liked it and copied the photo to my hard drive.
I calculated the pattern pieces based on using 2.5" strips.
When three such strips are placed side by side, the result is a 6.5" square, so that's how long I knew to make the strips.
For each rectangular "set", I used four 2.5 x 6.5" rectangles of two different colors. Each square set is made up of two blocks. Each block has four strips-- 3 of one print; 1 of another. The second block is the "reverse" of the first. Then you sew the two blocks together for one rectangular set.
My goal was to have no duplicate/repeat sets. But I didn't have quite enough variety of fabric for that, so if you look closely, you'll see a few repeats which I tried to place far away from each other.