It's my favourite feature! You might want to consider it for your work of art!
Here is the link at the Home Depot site:
Slate Mosaik - 1 Piece | Home Depot Canada
They are very easy to install, they look really nice, and are easy to keep clean.
Have fun! Can't wait to see more photos. I just bought a 12 foot Dolphin that I am going to overhaul. Mostly cosmetic, although I was considering having some of the cabinetry rebuild - it just seems a bit flimsy. Although the framework of the trailer is excellent and I am very happy with the layout.
I will post pics as I go.
Again - congrats on a great job. It must be very fulfilling work!