OK, back patted.
Your turn! hehehe
Without your advice, I am afraid to picture how this job would have come out. I owe you one!

Yes, sample boards are a critical step when going into a new technique or material - or even when testing a new color choice (sure beats the checkerboards I've seen painted on some folks' walls!). The sample boards allowed me to become better prepared for the application technique, for sure.
The homeowner was unsure of the suede color "working" with the tile - until the job was complete... he was afraid the walls would turn out "bandaid brown", heh - but it ended up working just fine.

and incidentally, his interior designer (who chose all the colors and finishes) recommended that he use art to add color to the house - in fact, the whole ground floor was painted in grey, to make the art stand out even more. An interesting theory, and in this case, it seems to be working wonderfully.
Anyway, thanks once again for all the help & advice - I couldn't have done it without ya!