Hello. I think if it would be cool if blood became a healing spec for Death Knights. Here is how they could do it:
Death Strike:
Strikes an ally, making the target undead and healing them for x, but reduces healing received by 20% for 15 sec
Death Coil
Fires a blast of unholy energy at the target, healing them for x and removes [death strike debuff]. Only works on undead.
Heart Strike
Instantly strike an ally and his nearest ally, healing the primary target for x, and the secondary target for x, and infect them with blood plague (dot which heals the death knight, similar to shadow mend)
Blood Boil
Causes shadowy energy to heal all allies infected by Blood Plague withing 10 yeards for x, however, blood plague is consumed
Lichborne
30 sec cooldown
Makes all targets within 15 yeards of the Death Knight undead for 15 sec and causes Death Coil to heal all allies infected with Death Strike debuff
What do you think? I think this would make blood a much more interesting spec to play.