It's made from only two blocks, both of them on a 5x5 grid, with proper value placement being the key. You can see this quilter really paid attention, and it shows.
I've outlined the two blocks in the upper left corner.
32 BlockA (the corner one)
16 BlockB (star)
It looks like those are 10" blocks.
As long as the blocks are a multiple of 5 (5, 7.5,10, 12.5), it should go together easily.