I recently saw @glowforge1 post about engraving some tiles. They looked just like the subway tiles I had leftover from our house build a few years ago, except the ones they used were about 5"x5". Mine were more of the standard 3"ish x 4"ish. But I had a whole box of them, so I definitely wanted to try out some engraving on those things.
I picked up some colorful Sharpies just for variety.
I really like how they turned out. The feathers were found from Creative Market mentioned in another post about that design site. The fish design was just found on Google image search when I searched for “Adult Coloring Book Pages.”
The blue one ended up with kind of an ombre look to it. I think it came from using a bit of Windex to wipe off the Sharpie, and it wiped some of it out of the actual engraved parts. I like how it turned out though. For that one, I used a satin acrylic spray to seal it a bit. It gave it a nice matte finish. For the others, I used just some gloss spray lacquer, and I like that the shine was left on them.