This is the build I use.
http://www.wowhead.com/?talent=jcEMqI0IsbMzuAo0xZcxh
I have Glyphs of IBF, Vampiric Blood, and Rune Tap. Minors are raise dead, pest, and horn of winter.
With all due respect to everyone's opinion, Blood is not inferior at all. Not even a tiny tiny bit. I leveled 70-80 as frost. I have tanked all Heroics, 10/25 OS, 10/25 Vaults, 10/25 Naxx as BOTH frost and blood. I switch back and forth all the time. I prefer blood 10000000%. It is a completely different style of play. I focus on using my healing abilities. People very often underrate the healing abilities. Deathstrike and Mark of Blood are tied #1 on the underrated list.
My PUG healers have been getting bored with me. My standard guild healer is a druid who just drops HoTs on me and stops paying attention. I've gotten many many comments from healers saying "You don't even need a healer" when 10minutes before they would whisper me "I thought blood was no good" I flat out impressed a healadin in full T7.5 who immediately wanted me in his guild. I received the 2minute Loken kill achievement after my 2 rogues and fury warrior were dropped on 1st AoE, the pally (the previously mentioned one) that was the healer could DPS b/c he didn't have to worry about me. I do Patch 10/25 as Frost and as Blood, all my healers say they love the blood spec over my old frost spec. They d0dn't run out of mana or feel pressured as much. At this point we pretty much just use 2 tanks for Naxx 25 now (can't really do Patch that way though).
I have 0 hate issues (admittedly that might change w/pest damage being removed, but we'll see how BB holds up). I don't use obliterate ever. I tank multiple targets very often and lose very few against strong DPS (even careless ones at times). I never lose a boss. I have more HP from VoTW than in frost. From what I see, they nerfed Frost tree by improving frost pressence. Frost tree was about mitigation, but when they bumped up the armor gain in FP, they made blood that much stronger because the mitigation of the frost tree was not as necessary. So might as well heal yourself.
I know the responses already. "DS doesn't heal you that much, blood aura isn't that much, etc." But it all adds up. It is a situation that is hard to give concrete evidence.
Frost is cool, if you like it, use it. Honestly, I have yet to see a mildly competent unholy tank (that could be the players though, I've never tanked unholy), I don't even really see how the Unholy tree is a tanking tree outside of Bone Shield, but since people say that blood is weak and I'm great with it, I can see the reverse situation and bet Unholy is fine. Do not get discouraged by people saying blood is weak. It is not. And when it is learned to play properly, IMO, it is the best tanking spec for me.
I apologize how convaluted this has gotten. My stream of conciousness definitely went off tangent. I just want to demonstrate that blood is in no way weaker to frost. You just have to play it differently. It takes getting used to. It takes an appreciation for support skills, not just the stat sheets. I thought of ways on how to use it, and it's different, and I love it. If you want to tank as blood, you can do it.