I personally wouldn't use "visible" words made out of individual lettered tiles, due to fourth wall breakage, but I definitely like the idea of being able to customize engravings.
Of course, all deep customization decreases the random humor and surprising elements in this sort of thing, but I think it would be worth it. Ideally, I would like gradated options for engraving:
Free - You could tell a dwarf to do the whole dining room however he wanted. He would move at a normal speed, and you'd get images of bucklers and a self-portrait of him surrounded by cockroaches.
Genre - You could specify a type or theme of engraving. Say, "landscape", "industry", "victory", "battle", "defeat", "myth", "monument", etc. He would move slightly slower. So your dining hall is filled with pleasing landscapes, glorious historical figures, and images of cheese, with no disquieting images such as an "engraving of a dog. The dog is screaming".
Commission - This would be a designing interface, allowing the player to assemble generic as well as specific items and people into an image. You could leave some elements random if you wanted, such as the name. It would then be placed on a specific tile. A complicated commission would take a much longer time to produce, but could create some great results. A simple example: portraits on the walls behind each important dwarf's assigned table in the dining hall. More complicated example: a wall-length mural made from individual engraved tiles depicting traveling elves - trading elves - a deer leather hood - an elf striking a menacing pose - a dwarf striking a menacing pose - dwarves and elves fighting, a dwarf shooting an elf, a dwarf raising an elf-bone mug.
These advanced options could come from an engraver/artist's guild noble.
[ June 03, 2007: Message edited by: Locus ]