I use a clear glass pyrex dish in my girl's display enclosure. It's shallow enough that I can bury it up to the rim in the substrate, and it blends right in.
Most of those faux rock dishes are crud. The textured inside makes them impossible to get completely clean, so you have all kinds of bacteria growing in your snake's water, they're usually way too small for an adult snake, and it's not unheard of for the paint to start wearing off...
I had one of those faux rock dishes once, and between the paint washing off into the drinking water and the film of yuck that never came off (textured bottom, again), I finally threw it out and went back to the more "utilitarian" mini casserole dish.