A few other random ideas:
-pillars with accelerated quanta production but with an additional cost, like producing 2 quanta per turn but dealing 2 damage to you per turn
-pillars that produce 1 quanta per turn but can be sacrificed for a one time gain of multiple quanta, and not necessarily of the same kind
-pillars with variable quanta production based on formulae that count things like permanents, spells played that turn, hp, creatures in play, etc
-pillars with other comes into play abilities or sacrificial abilities like hp gain, damage dealing, poison removal, etc
-pillars that have bonuses, either of quanta or other stats, based on how many of them you have, kind of like how Hope gets stronger (but not necessarily linear like Hope)
Also, as a side effect of having more types of pillars, earthquake will receive an indirect nerf, which it sorely needs :p