That's perfect, because my plots and character concept deal with Ava Greyjoy being the head of the house. I'd love to hear your plot idea, because I want to keep Greyjoy open for your possible plots and ideas.
This is sort of a bunch of pieces of ideas and not a full idea, but I was thinking of going a descendant of Victarion Greyjoy (Balon's younger brother, Asha's Uncle) -- who more understood/respected the the value of riches/treasure. Publicly, he'd be somebody who worked on the docks (more administration than physical labor, how 'far' up the ladder can be discussed) -- but is actually running a criminal organization in King's Landing -- sort of an urban take on the 'Iron Price'.
He pacifies those back home by feeding them information about vessels worth pirating that head towards/through the Iron Islands, or utilize the rivers that cross near the mainland, as well as some idea that he's trying to secretly 'sabotage' the Iron Throne again. Though in actuality, doing anything really serious against the Iron Throne would be hard to swallow given that he's living a rather comfortable life.
I'm just not sure what form I want the criminal organization to take. Slaves lends itself to gladiatorial matches pretty easily, and also creates a retinue of loyal thugs...