Disappearing Hourglass Quilt Block in Batik. 5,6.23

I wanted to make a quilt for Ning's sister, that I could make faster than the usual  cotton men's shirt upcycle quilts.  There are various versions online of disappearing hourglass.  I decided to use batik as the deeply colored parts and off-white with grey markings for the background.  I ordered precut 10-inch sampler bundles, but will also add some other fabrics.

First sew together a light and a dark square, facing together.  Sew a 1/4 inch seam all around.

One thing I discovered, is the precuts are not all perfectly square.  So it takes some finagling.

Then, cut corner to corner, both ways.  (I didn't photograph the first one, so the color is different now.

Then open what are now half square triangles, press, rearrange to make hourglass blocks.

Sew together.  That's the hourglass block.

Then cut into perfect thirds, horizontal and vertical.  That disappears the hourglass.

Now it's a nine-patch.  Rearrange the sides, corners, and middle.

Sewn together like a nine-patch, the block at the top is the result.  There are some challenges.  All of the pieces are on the bias.  The corners didn't come out perfectly on the first two blocks.  I think it still be ok with practice.  Also, the white backgrounds in the sampler aren't all what I want, so I need to replace some.