Just a bit of fun with some white and black vinyl on an old worn out puzzle from my collection.
I've no idea, if it's been done before - my apologies if it's in the wrong forum.
I'm not sure what the official Shepherd pattern is, but this will suffice. I was hoping it would make the Skewb extremely difficult to solve. It's certainly more confusing, but not quite as much as I hoped for.
I also experimented with Shepherd style arrowing on a Pyraminx but with radial arrows rather than horizontal and vertical arrows. In this case, 2 faces would have outward arrows and 2 faces have inward arrows. I only got as far as a rough mockup using masking tape and a felt tip pen. It still seemed quite trivial, so I didn't bother taking it any further.