You could modify the size of the blocks of the Warm Wishes from 6" square to 6 1/2 " square and make something very similar with jelly roll strips and layer cake. The tri-color "unit" of the Warm Wishes uses a 3" strip in the middle with a 2" strip on each side. When sewn together, the unit is 6" wide and is sub-cut into 6" squares. If you used jelly rolls, you could sew 3 jelly roll strips together. The width of the strata would be 6 1/2" so you'd need to sub-cut it into 6 1/2" squares. Then the focus fabrics (block A) would need to be cut 6 1/2" to match up to the "units". The overall look would be a little different. If you have some scrap fabric, you could make a test unit and lay it out like the Hanukkah block that's shown in the instructions to see how it would look.

If you cut the squares of focus fabric from layer cakes, you could get some 2 1/2" strips from them too.