Gad, work had me tied up all day but I WILL respond, grrr.
There's a lot of hints that 'The Stone', the gods the Profane feasted on, and 'the blood of the world' may all be connected. (Jury's out on whether the one possible Titan spotting was asking for lyrium or dragon blood. The World of Thedas Volume II's mention of the dwarf led ships from the west buying lyrium and fleeing a catastrophe of some kind suggests the Titans needed lyrium to me.)
So red lyrium is lyrium, living in a way, that has been corrupted by the Blight. From the murals in the Arbor WIlds, and a lot of hints through the stories of the elven gods, it seems that the Blight is somehow connected to the Void and the Forgotten Ones. Andruil hunted them in the Void and was corrupted by the Blight and is depicted as having armor similar to Samson's rock-candy suit. Mythal eventually cures her, but not until she ushered in an age of tyranny for her own subjects and wreaked a lot of havoc. It wouldn't surprise me to learn that one of the gods tried to use red lyrium as a cudgel against the others to gain power, only to have it backfire. It reminds me of the Bore in The Wheel of Time. Ancient Aes Sedai trying to tap a new power source, only to discover they just broke open the primordial manifestation of evil and he wants to play.
One of the best theories on Solas's backstory and the downfall of Arlathan was that red lyrium began to corrupt them, Mythal was assassinated, and the whole thing descended into lunacy. Solas, uncorrupted by red lyrium, as Cole mentions Solas warning the others, seals them away, and figures that the elves can lead themselves now.
The Primeval Thaig's latest theory I've heard was that the ancient dwarves sealed their mages away. These mages began to consume massive amounts of lyrium, red or otherwise, and became the Profane. What's curious is that red lyrium is Blighted, according to Bianca, but the Primeval Thaig is free of darkspawn and other obvious signs of the Taint. It could be evidence for the Blight's influence long before the darkspawn.
What I want to know is how red lyrium feels to a dwarf with stone sense. Oghren's was strong enough to detect the amount and quality of it in the mountain at the Temple of Sacred Ashes, (Which seems to have been built over a temple to Mythal, judging by the mural.) and I doubt that it was red then. So Corypheus's ritual to rip open the Fade turned it red? Or was his using Blight magic with the Orb that managed to cast a pallor over the nearby lyrium? Or does enough raw magical power equal the Blight?
So we've got a lot of ideas. 
EDIT: Also: "OOOOODDRIN! OOOOOOOODRIN!"
I couldn't help but picture you joining that crowd in crying out for The Witcher. 
Yes. This. I remember reading about this and liking the theory. I totally agree about the Bore, too, that's the first thing I thought of on hearing about Andruil's... exploits. Actually, knowing WoT (and seeing as it seems to be a massive source of inspiration for Bioware), we could probably piece together a lot more on this just based on the parallels.
So, this is interesting by itself, that the Primeval Thaig was free of darkspawn, that would really indicate a different timeline than the Chantry version (which is naturally suspect anyway) with regard to what the Blight actually is and where it's from... this theory on dwarven mages is fascinating, though I want to mull it over a bit more before I get any ideas.
Now the stone sense - I'm wondering, is it possible that the orb itself is somehow the cause of corruption? I mean, it is the "power of the gods" as we understand it based on our vague information, could it be that this is like the Choedan Kal of Thedas? Perhaps not directly corrupt, yet without the ability to control it properly, the inadvertent "evil life-giver" in a sense? It could bestow a kind of spirit power on lyrium that is unnatural to it, I mean, red lyrium is way different to regular lyrium with its aggressive spreading and its actual consumption of living things to procreate it becomes the next thing to being corrupt itself. Much to speculate on, hmm. Or like basic alchemy - the mix of these particular energies causes a kind of "fissure" between worlds which isn't supposed to happen orginally. Hmmm....
(I'm right there in the Witcher crowd, believe me, showing off my Zoltan-style lion roar to find Odrin!
)
So computers need a certain amount of free space to 'breathe', so to speak. My computer has long been crazy and slow-running (fifteen minutes to start-up), because when my computer nerd friend said, "Yeah, seventy gigabytes of free space for your rig," I apparently heard, "Five gigabytes of free space is ideal." 
Cue the deleting rampage, the uninstalling horrors. I'll miss you, Rome II, but your little sister Attila is just flat out better than you. 
So I get rid of sixty gigabytes of crap. Check my amount of free space. It's gone down to 4.5 free gigabytes. I reboot, I follow the guides on various technical websites.
It's down to 3.5 free gigabytes now.
But it starts up faster. But it runs slower.
I'm close to embracing my inner Luddite and just chucking the computer out the window.
Oh, wow. 3.5 gigs and it runs... you need at least 15 for smooth functionality, but more is always better. I try to keep as much free as possible without sacrificing my favorites, hahaha. Also, the reason why it goes down is because you're actually creating new temp files, etc. by running applications, including uninstalls, but you can unclog a lot of gigabytes if you have a program that clears away that sort of unnecessary stuff at regular intervals. Anyway, I'm fairly good at this sort of thing, if you ever need a brain to pick. 
There's also the idea of "gangue" or impure spirits of the stone. The dwarves consider it their duty to take it out of the Stone. I wonder if their idea that the Stone is alive comes from lyrium veins, which turns out are alive. Therefore impure Stone would be corrupted lyrium?
Ah, yes! The culling of the gangue - like a plague in the stone, hmmm...
The dwarves sure do seem to deal with demons a lot for people without mages.
Then there's Malvernis from Legacy. A pestilent creature that managed to corrupt the Stone itself and was imprisoned in the surface by a Paragon.
So you've the usual, "Well, we cut out the parts of society that drag us down" ruthless meritocracy part of their culture, and you've got the actual Blight creeping up the walls of the Deep Roads and the red lyrium that's starting to blossom and move up to the surface. (A giant plot point that was never addressed fully in Inquisition, much to my frustration.)
And in Fairel's Tombs, the Tevinter magisters seem astonished that dwarves were able to imprison demons and use them as guardians.
I think there is so much here that needs exploring - maybe in a DLC...?
They've really gone into digging into lore in Inquisition, so it's entirely plausible they will address this further... I mean, red lyrium is really prominent throughout the game. The fact that it kind of takes a backseat to all the revelations makes me think that they will expand at some point, as it's kind of a large loose end.
The Gangue Shade is a demon you can summon in Origins too, by wearing all the Legion of the Dead armor. There's clearly something funky going on with dwarves. The whole "severed arm" thing and Dagna's "have to be separate to use it" makes all my lore senses tingle.
*shakes fist* GIVE ME ALL YOUR SECRETS BIOWARE!!!!!
O! I didn't even know about this. Or did I? I had Legion of the Dead armor, I think Oghren got it; how does this come about?
The severed arm thing is really suspicious... in fact, a lot of Dagna's cryptic revelations are fascinating that way.