I think it's a bunch of Y seams too. No seams in the big blocks as far as I can tell, so it's not a D9P or a strip block.

I laid a tile floor in this pattern once but this would be way too many Y seams for me to make into a quilt!

The Xanadu quilt looks similar to the original one posted, but the original one does not appear to have any seams in the large blocks. The Xanadu quilt appears to be 2 2-1/2*4-1/2" blocks pieced together to create the illusion of being one single 4" finished block. This could easily be done by cutting a jelly roll into pieces.

The other possibility for the original quilt is that it was done using English Paper Piecing with 2" and 4" paper squares. Since the original quilt does not seem to have more than one solid piece creating the large block, I would bet that it was made using EPP.

You can buy this pattern "Xanadu" at Virginia Quilter (see link above from Sewnoma's post) for $9.99.

No y seams and is classified as "easy".

Not a D9P, and I think it is not small squares or strips either. A day or two ago I saw a tute on how to make a basket weave. Lots of partial seams, but the results were stunning.

It looks like they took a 3 inch square and sewed a 1.5 inch square to it and then sewed another 3 inch square. WOW, lots of work on this block !

I spent about an hour playing with squares trying to come up with a consistent way to join the blocks just using partial seams (no Y's). No dice. Maybe just go with the Xanadu idea and slice the large blocks into 4. If the fabric is busy, the seams won't be that noticeable.

I'm gonna guess that is made with partial seams. I'm working on the Briar Patch pattern from Judy Niemeyer right now, and it has blocks and setting squares sewn similar to that, and will use partial seams (when I get to that part).

Could it be a whole cloth?

It looks like the Xanadu pattern that was mentioned.

Not a clue here.