I'm thinking these should be tied to the tiers so Minor, Major and Great, require Heroic, Paragon or Epic level to be accessed, as well as a strong enough bloodline.

Also thinking perhaps they should be done like items in that you get to use one Daily Bloodline ability per milestone.

Alternatively like feats, but I don't think they should take away from the feats a character already has to spend Bloodline should be a bonus.

Any one else had any thoughts?