I keep toying with the idea of a Flonha Gallant, which I think would play somewhat like a roguish paladin. Mechanically, it seems like it would work well. Fluffwise, it's a bit of an odd pairing...
I'd almost certainly take Extra Spell Seed at 1st, and seeds would probably be The Mind Believes and The Following Shadow, which would give a crazy amount of versatility...
Edit: One thing I'd meant to ask: how do you handle multiclassing between different spellcasting classes? Do you pool their spell points? This might have been addressed somewhere, but I don't recall seeing it...
Can they combine seeds across classes?