They’re not fancy marquetry, but they look pretty good:

The darker areas are laser-engraved with the usual SCP warning label geometry.
The left set was engraved through blue masking tape, which increased the exposure, added no benefit, and required fiddly cleanup. Won’t make that mistake again.
The middle one has the darkest wood of the set with the lighter part not exposed to the laser.
They’re slightly smaller and much lighter than the plastic versions in order to fit them on the remaining DIY veneer plywood from the knitting stitch counters.
Rather than make another fixture for the backside branding, I cut adapters using the two outlines and dropped the hollow triangles into the fixture:

Two layers of veneer feel about right, although the layers should not have their grains oriented in parallel as these do. The PSA sheet on the back veneer holds them together, but they’re too flexy for confidence.
The contrast between gentle natural wood (using a generous interpretation of “natural” for veneer with a PSA layer) and the SFnal SCP warning label symbology is definitely amusing.