If you were willing to do it with a movable, handheld stencil, you could do alternate rows. If you view them as horizontal rows of hexagons with every other hex missing, you could spray a row, move the stencil down and to the right a little, spray the next row, etc. It would be fairly approximate.
For better results, use an expendable, stuck-down mask, though that will take a lot of extra time, or have it printed onto vinyl.
But of course, it's never going to look quite like a 3D surface. I made up a load of cast latex panels just by stippling a few (3-5, maybe) coats of latex onto car footwell mats with a block of sponge. You can dye the latex with kids' powder paint, although make sure it's well mixed as lumps will cause little "bombs" of colour that burst as you stipple. Use light coats and a thin consistency of latex to ensure bubbles are visible and can be dealt with; it's almost impossible to avoid a few small ones.
You could possibly use that technique to cast and replicate some of the real panel, if you can perhaps get a small sample quantity or make some up yourself.
Of course if you need it to be hard, you can do it in fibreglass.
If you wanted it as a quilted effect on fabric, you could layer some thin upholstery foam between two layers of fabric (spandex works since it stretches) and quilt it in using a needle and thread. Might not get you exactly that, but you could come up with something close. Possibly the most time-consuming approach.
You can also stamp patterns into foam-spandex layers. If you can put a patterened item on top of the foam-spandex stack while the glue is still wet and weigh it down (a stack of books, bricks, etc), you can get the foam to stick together internally and leave a print of whatever pattern was on the block.
Depends what you're after doing with it really
HF
