Regarding engravings, I almost never engrave my walls or floors, so that slipped by me. I don't think I changed anything aside from the color settings on constructed walls/floors, but it's certainly possible that I made a mistake somewhere while saving changes to tiles. I don't really know much about graphics editing, just kind of bumbling along until it looks right, so it wouldn't surprise me at all if I screwed up transparency settings somehow.
Anyway, please do bring up anything you notice that's broken, and share anything you've done that looks good. A while back I was planning to throw something together for the other new professions, but real life got in the way and I never really got around to it. Ideas very definitely welcome for both color palette and design suggestions. I was thinking something along the lines of holding a largish book with a cover related to the subject for scholars, but that's as far as I got.