As a graphic designer, I can tell you that a detail like the wall height to tile size ratio is actually a very specifically chosen value based on a number of trade-offs and priorities, and not something easily arrived at because it just looks pretty good. Which isn't to say that a given ratio is inevitable (or that the match in this legal case is pure coincidence, it certainly is NOT), just that you may wish to be aware that you're short-changing the designers based on your lack of domain expertise.