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[Euld]

Blood could be another by-product of butchering (and can be collected from the recently killed), and could be stored in vials (or maybe buckets?) if any are available.  When fiddled with at an alchemist's shop (with what else, I have no idea lol) it is made "uncongealable", and can be poured into specifically designated areas   Although you'd wait until you had enough to fill a spot up to 4/7 so it won't dry up.  And screw pumps to make a waterfall of blood, mix and enjoy.

[Craftling]

Time for the soldiers to fill their flasks with the dead recruits blood.

[Ubern00b]

Bump for the love of this idea.

We need blood fountains, and elf traps involving them drowning in puppy blood.

[Draco18s]

How about if you let blood not flow, it turns into something a bit like this:
http://en.wikipedia.org/wiki/Black_pudding

Or maybe it just would turn sort of like a scab.
Or possibly, and this would require alot of blood, you can boil it and get the components, such as iron and things which are in blood, depending on amount of blood.

Waitwaitwait.

Blood: the fifth iron ore?

[Voltaggia]

Given that an average adult person contains 3 to 4 grams of iron I doubt that you would be able to smelt anything...

Though the idea of slaughtering thousands of goblins to make that one bar of iron is awe-inspiring.

[darkflagrance]

^ It could be called "blood iron" and when the magic arc is introduced have the additional quality of crying out with the voices of thousands of wronged souls whenever psychics are nearby.

[Maggarg - Eater of chicke]

Anyhow as for a Blood Fountain... Where would you get a constant flow of blood?

Presumably you've tapped an artery on one of those giant tortoises from that one silly thread...

That was the best suggestion ever.

[sweitx]

Anyhow as for a Blood Fountain... Where would you get a constant flow of blood?

Presumably you've tapped an artery on one of those giant tortoises from that one silly thread...

That was the best suggestion ever.

And

Given that an average adult person contains 3 to 4 grams of iron I doubt that you would be able to smelt anything...

Though the idea of slaughtering thousands of goblins to make that one bar of iron is awe-inspiring.

You guys are not thinking about this enough!  Just grab a bunch of megabeast (preferrably those with good healing).  Build a room alternating floor and channels with grates at the bottom with the floor covered with spike traps.  Then, find out how fast for each of said megabeast to heal their wound and construct a water-based timer that toggle the spike traps.  Then pit those megabeasts into the room.  Now you got yourself a periodic supply of blood, from which you can extract iron or power your blood fountain.
Bonus, create a pitfall trap above it and drop invading armies unto the platforms.  Now we not only get rid of those pesky goblins/orcs/elves/humans, we now have a constant supply of blood.

[QuakeIV]

When more liquids are added, id drown my enemies in a combination of blood, vomit, and urine.

[HatfieldCW]

Magma doesn't harden, why should blood?  And once our dwarves learn how to clean things properly, maybe fluids could get properties like lubricity and viscosity, so an axehandle with blood all over it would be slippery, affecting wrestling checks and fumbles.

[silhouette]

vote for blood!

My statues and massive projects need them! Especially the "chucking off a 20z level tower into liquid"

What is better than a BLOOD WATERFALL IN THE MIDDLE OF A DINING ROOM?
Obviously it wouldnt give off mist... or... would it?

BLOOD FOR THE BLOOD GOD.

[Doodle]

Everyone's always been talking about blood fountains since the beginning of the project, and admittedly I want them in whether they really work or not.

But in all practicality, how do we know that in real life, it won't have congealed in a few days, leaving us with little more than black goo at the bottom of our glorious blood fountains?  I really want to know; what temperature would the room have to be at, how quickly would you need to keep the blood flowing?
How many pathogens would settle in the *edit*BLOOD*edit* after a year?
Would there be any serious impact if I filled my fountain with troll blood instead?  Are all bloods the same weight?

I'm hoping somebody here knows, because my searches to discover anything on the project of building a blood fountain not only turned up rather fruitless as to any relevant knowledge on the topic, but also likely got me stuck on some FBI watch list...

-.- edit for bad wording

[Geb]

But in all practicality, how do we know that in real life, it won't have congealed in a few days, leaving us with little more than black goo at the bottom of our glorious blood fountains?  I really want to know; what temperature would the room have to be at, how quickly would you need to keep the blood flowing?
How many pathogens would settle in the *edit*BLOOD*edit* after a year?
Would there be any serious impact if I filled my fountain with troll blood instead?  Are all bloods the same weight?

Well... blood is made to be stable at around body temperature. It's exposure to open air that causes clotting as far as I recall.

It ought to rot very, very rapidly, it's almost pure nutrients. Once the immune system dies, it's a free for all that should leave you with a foul smelling acidic black lumpy sludge.

[Doodle]

This is sort of answering my own question, but the only resource I could really find as far as how long blood stays fresh was information on blood banks, here's a wikipedia link for those curious.
http://en.wikipedia.org/wiki/Blood_bank
It just seems that regular folks aren't interested in the stuff after it has left the body in an unsterilized environment 

It says that blood has just a little over a month's shelf life before it is considered unfit for transfusion, with the blood probably needing sterile packaging and a refrigerated environment for that to be true.  I still don't know the rate at which blood spoils or hardens specifically at room temperature, and I don't have the slightest idea where I'd go about finding that out, but it seems that if one really wanted to go about making a blood fountain without having to drain and refill it periodically, they'd have to do it in a very cold, sterile room, with the fountain itself having probably been purged with fire and antibacterials. 

I'm sure that very few people are keeping their fountains around as an emergency blood bank, and if its not allowed to sit, the blood probably has at least a day of being pumped around at high pressure before it becomes nothing more than a stinking black mass, but that's still just a guess.
I also have no idea how air exposure would specifically affect just blood, as I'm not entirely sure clotting is facilitated only by the blood stream...

If anyone else has any thoughts or knows more on the subject, I'd be glad to hear about it.

[darkflagrance]

Well, mosquitoes have a chemical that prevents blood congealment. Maybe somehow crushed mosquitoes could be added to the blood to prevent congealment?