Yeah, MA Jotunheim can pull off blood fairly well, and you're always going to want more hags for everything.
An odd one worth mentioning is Bandar Log. No native blood mages, but they keep almost all the blood summons of Lanka, PLUS all the celestial summons of Kailasa. You can eventually grind your way up to dakinis who have B3, but it's a stretch at Blood 6. What's really fun is getting the White Bandar to go around naturally suppressing unrest (and auto-summoning more mooks who do the same thing) to keep things quiet in hunt provinces without hurting the population through patrols.
Pangaea also has the pandemoniacs, but they're expensive as hell (hah) and cap-only.
Vanheim and Vanarus have just enough blood to get you interested, but not enough oomph to do anything cool with it and no ecohunters.
Y'know, I'm actually kinda sad that R'lyeh doesn't get any blood power, as their theme really would tie into all the ritual sacrifice and, y'know, summoning horrors. Also the blood vortex ritual is pretty much fluffed straight out of Chulhuville.
Oh, right, just remembered something... Y'know the giant fetish pretender that Machaka gets? The mindless, lifeless pretender? Yeah, well, horror mark doesn't work on mindless dudes.
I've dicked around with this before, and you can just walk into a battle with a few slaves and call horrors, and they'll ignore you and go straight for the enemy. Even if you do get marked through casting or items or something, all your marks get wiped at the start of the next map turn.
Now, the horrors WILL attack you if you're the last thing on the battlefield, but they'll leave you alone until then. Their attacks will also plant more horror marks, but this does nothing as the marks will, as mentioned, just disappear.
The problem lies in getting blood and astral onto a giant fetish and not just being a one-trick pony that's late to the show...
EDIT: Also, regarding the actual reason I started writing a post in the first place (the Eater of the Thread)... Dayum. Shame it didn't keep spreading the dude's dominion, that would've been hilarious. Now I'm just trying to imagine the best/worst things you could put on it to make it even more ridiculous.
Also, honorable mention to the six-armed crone down near the bottom there.