Two new invocations while I'm still thinking about this set:
Lesser; 3rd; Eldritch Essence
By weaving spiritual substance into your magic, you become capable of striking even the insubstantial and miring the spirits of your opponents.
This eldritch essence invocation allows you to change your eldritch blast into an ectoplasmic blast. An ectoplasmic blast suffers no miss chance against incorporeal and ethereal targets. In addition, a creature struck by an ectoplasmic blast must succeed on a Will save or have their movement speed halved for one round.
Lesser; 3rd; Blast Shape
You form a snarling bolt of eldritch energy that hounds your enemy.
This blast shape invocation allows you to invoke your eldritch blast as a bolt of persistent eldritch magic. A hungry spirit creates a pattern of eldritch energy in a square adjacent to you. Each turn, starting on the turn you invoke it, you may direct it as a free action. A hungry spirit can move up to 60ft each turn, and if it enters the space of a creature, it may make a melee touch attack against it, using your attack modifier. If the attack hits, the creature is affected as if struck by your eldritch blast (including any eldritch essence applied to the blast). The hungry spirit lasts either until it successfully hits a target, or for one round, plus an additional round per five caster levels.