A weird Astral Blessing idea I had.
This is an idea that came out of left field (even for me) the other night.
Passive Aura: All allied champs in the area (including soraka) gain X HP/5 seconds and gain 6/7/8/9/10% of Soraka's bonus Armor and MR.
Active: For the next 60/75/90/105/120 seconds Soraka gains vision of the area. She gains one charge every 20 seconds and can hold up to 1/2/3/4/5 charges at once. Allies standing in the area gain 8/10/12/14/16 HP every 5 seconds. This stacks with her passive aura.
So it'd be a passive healing aura that grants bonus defense and an active ward that is an AoE healing aura in the range of vision.