For a Frost PvP build without Hungering Cold, I was actually thinking of something like
Talent Calculator - World of Warcraft.
Pros:
Unholy:
The tier two talents are all pretty good for PvP.
-Death Grip should be used a lot especially in arenas to counter pillar humpers
-Epidemic as DKs are prone to being kited, diseases should last as long as possible to get any Obliterates off without having to reapply.
-30% dispel resist would help also.
I don't believe it's worthwhile to go further to get On A Pale Horse, the other talents are pretty trash.
Frost:
-With Icebound Fortitude glyph, you will get 18 seconds of 50% damage reduction for 0 RP which can be huge.
-Frost Aura might also be useful, providing fairly decent (80) resistance vs casters.
Blood:
-I believe more Oblit crits and AP is more useful than Hungering Cold or going further in Unholy, depending on the bracket and setup. Obviously if the CC is required, then points would probably come out of Blood than any other tree.
-The last 4 points should also probably go in this tree, either in Dark Conviction or Two-Hand Weapon Specialisation, whichever provides more dps.
Cons:
-No Mark of Blood, very useful vs non-dispellers and Rogues.
-No Rune Tap.
-No AMZ.
This spec is fairly bursty as with any Frost spec, but also provides good defense through Icebound Fortitude.