You actually are the first to make me consider a graphicspack. If you'll make it compatible with the orcs: more things to kill mod I'll definately try it!
Really cool looking.
The game doesn't actually use the term graphics like that. The closest term that makes sense would probably graphical font.
Graphics are specifically restricted to animals and such- basically anything that shows up in the u menu. The floor, walls, text, and things like barrels all use a letter but in fonts like this that "letter" is drawn out to look more like the thing it is used for.
In the case of the character used for bottomless pits, wells, and bracelets those are all a similar shape so it works well but some of the ones used for trees and the sides of bridges don't work so well because they are so visually different, but it's all still letters as far as the game is concerned.
Because it is only available in the 40d# versions, which are not yet an official release. Also because the wiki is notorious for being out of date.
Most of us are pretty into reading a wiki for info but not editing one :/
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I think that these walls look too "fat" and the engraved floors and walls should have more contrast- just removing the bits at the corner that give those white squares in the middle of a 2x2 engraved floor.)
I'm not really liking the little jut out at the end of each straight tile either- seems like if you wanted the interior of square rooms square that shouldn't be there, and we can easily tell how much seamless wall there is by counting floor tiles instead.
The walls have been engraved and that's cutting into stone- not plastering some unever texture on top of it (I'm aware that it's hard to remove things in engravings the way the tileset works but still) I'd recommend a still smooth outline in the secondary color but you kind of have to see it to know if that will work.
The workshops especially seem too uniform. My eyesight tends to be pretty blurry after the reading I have to do any any day I would call productive and that's just unrecognizable. That static has definitely improved over what you were using before but maybe you can thin it out just a bit more.
Overall it's pretty nice though and I might find myself editing parts of it into what I use.