Need a Consultation -- STAT!

Here's a sneak preview of Pictures at an Exhibition.  I'm delighted with its progress so far.  I love the lattice fabric.

Here's the question:  Do I use the white cornerstones with the lattice or keep it all the grey print?  I think I know which I prefer, but would like a couple of other expert opinions before I put the rows together.  Keep in mind that both versions show the horizontal lattice before being stitched; it will finish at 1/2" less than shown, matching the lattice between the blocks.  Which way do you think I should go?  As always, clicking on the picture will enlarge it for better visibility.