"(a stone dwarf, grayed out and immobile!)"
This gave me an idea:
Another thing about statues is, dwarfs would probably be clever enough about them to allow for interchangeable parts, in certain cases.
So that you could "equip" certain statues with a weapon, with armour, with whatever. They'd basically be exactly like the quote above: a stone dwarf, grayed out and immobile.
So hopefully not a whole lot of code involved.
Ofcourse, your real dwarfs would have to have a way of adding the items to the statues, but it would be a lot more interesting if they could add spare weapons and armour to the statue, instead of just throwing them on a pallet.
Stonecarvers, glasscutters, bonecarvers, metalcrafters, idle weapon/armour smiths might even make items that were specifically tagged "statue only", meaning they would look nice on one of these 'action-statues' (because, what's an action figure, after all, but a little tiny plastic statue?), but wouldn't be balanced properly, designed, or sharpened, to be used in actual combat.
Weavers/Clothiers, possibly with the aid of a woodcarver, etc, might display their wares next to their shops on mannequin-type statues.
Other shops might do the same, and such statues might help attract customers.
Statues could also be painted/repainted over time, and ones with eyes of glass or bone might possibly be exchanged for large cut gems, down the road, or just replaced (possibly by a spy, with a message concealed behind it).
Some of them might even be anatomically correct (and I'm talking internal organs here) to the point where they could become surgeon's tools.
Their chests, heads, and limbs might have little doors that open up, for instance.
Bloodflow might even be simulated (more or less) by water that's been dyed a cheery red.
Another thing dwarfs might do is spontaneously create a statue, or statues, in-for instance-a salt mine. This was actually done by human miners in the Wieliczka salt mine, located near Krakow, Poland:
http://www.photo-exhibits.com/europe/poland/wieliczka_salt_mine_photos/color_photographs/wieliczka_statues.htmlhttp://en.wikipedia.org/wiki/Wieliczka_Salt_Minehttp://www.thesalmons.org/lynn/saltmine.htmlhttp://www.travelblog.org/Europe/Poland/Lesser-Poland/Krakow/blog-6241.htmlI haven't been there, but I've always wanted to go.
Unfortunately, apparently a lot of the statues are being damaged by moisture, so they only open up a tiny bit of the mines to the public, while they're trying to conserve the sculptures.
Such statues in your Fortress ought to last, provided you kept them away from too much moisture--including too much foot-traffic, depending ofcourse on your biome.
Spontaneous sculptures might also be formed in ice that your dwarfs have access to. They might take it upon themselves to decide to sculpt a frescoe of something they like, or a dining scene of their friends, etc (in Weilicza, there's a very accurate reproduction of Da Vinci's 'Last Supper'), or even religious icons.
These might be destroyed every year (the sculpture representing the god of winter, perhaps?), or they might last-as long as they were kept away from heat-depending on the biome your dwarfs occupied.
You'd *really* want to keep dragons and fire imps away from them, though.
Statues might even be carveable from natural stalagtites-stalactites, which would then be susceptible to vibration, so you wouldn't want your dwarfs doing any heavy work around them, like additional mining, except possibly your Legendary miners.
Other statues might be carved from gypsum, which reacts badly to moisture, changes in temperature, and to vibration--but I don't think as badly as salt does to moisture, or (my fantasy version of) stalactites/stalagmites to vibration, and ofcourse not nearly as badly as ice to heat. So, while pretty much anything could destroy them over time, they'd be a little more hardy than salt (to moisture) stalac/gs (to vibration), or water (to heat).
Another type of "statue" could be a naturally beautiful/unusual rock or crystal formation, like this one:
http://giantcrystals.strahlen.org/america/naica.htmNot a true "statue" (statues?), but certainly statuesque, and something you may want to preserve for your Fortress. They'd be a little more fragile than gypsum true-statues.
The crystals themselves aren't particularly valuable as minerals, in this case, but maybe Toady might want to occasionally add a "formation" (or whatever) tag to the geology engine, which would give such rocks/crystals an added value modifier (once you discovered them, by exposing them to the air), as long as you
left them alone, and didn't try to mine them.
Considering that an emerald cluster larger than the chair you're currently sitting on (even if it's a barca-lounger) was recently discovered, and that gold itself very occasionally forms crystals, such a discovery might factor in to a very large portion of your Fortress's wealth.
It might even lead to tourism!
Ofcourse, you could still mine a few of the crystals out, if you had to, and leave the rest in place, if only for aesthetic and traffic interests, but once a certain percentage of the whole was mined, they all could become just rocks.
Some might be extremely fragile, and others might be totally unaffected by change, depending on the type of crystal, and the formation itself (which might have a base durability-either positive or negative? which could then be added to the durability of the gem or gems (in the case of more than one type, the average of the two) it was made from.).
Considering the fragility of these different types of statues, you'd have to consider their needs, if you wanted to preserve them, which again would add a nice little strategic mechanic to keep in mind while designing your unique fortress.