a few nice designs (anything improves that boring grey!) but your fingertips are gonna be feeling a plastic surface and not nice satin.
https://www.oversynth.com/teenage-engineering-opz-overlays
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I quite like the ‘user manual’ underlay - it would be quite useful. And I had to laugh when I looked at the picture as one of the little rubber feet is loose - just like the rest of us 
CB
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very interesting! I want the underlay!
print your own, laminate and keep in your Z case. Do you want to feel that glossy sheen?