Thank you! That was my first-ever-wholecloth.
Then I decided to try another idea or three or ten, and came up with another one - still inspired by Cosmatesque architecture, just not the same as the first one.
But, really, the original post was essentially "how/who should I give credit to?". Simply the same as I'm doing here - describing the architecture (or giving the name, such as "the Cosmati Pavement at Westminster Abbey"). If someone else happens to be equally inspired, that doesn't take away one bit from your own interpretation.
Here is my second wholecloth: