Primal Draconic Sorcerers?

[CaptainFord]

I've been tinkering around with sorcerer builds and come to realize that their are dragons that are actually tied to the elemental planes (cloud, crystal, magma, brine and umbral).

I'd actually like to pursue this line of thinking and make a sorcerer who descends from a primal dragon over a chromatic or metallic one. Problem is, I'm not sure what the best way to do that is, and I can't seem to find guides specific to that... so I thought I'd start something of a think tank for it.

This is mostly a flavor dilemma, but it will probably require a bit of optimization to reach the desired function. Obviously, magma dragon sorcs will like the typical draconic bloodline flavors, but for something like a crystal or cloud or umbral dragon... what spells should I pick? Do I go crossblooded with draconic and elemental bloodlines? Should I consider going Dragon Disciple to emphasize the dragon flavor?

Some thoughts would be appreciated.

[Dryad Knotwood]

Legacy of Dragons is a Pathfinder Player Companion that comes out on Aug 4 and has all of those, so you could use that

[Lanitril]

While Dryad is exactly right, if you can't wait for it and or pay for it, I'd look at what you want from the build and talk to your GM about what you can do for now. Maybe there's something similar from the current pickable dragons, and you can adjust it for your own use. And if you guys do pick up the book or its contents, you can use it then.

All in all, I find what kind of dragon you are to not at all change how you manifest it class feature wise. Just maybe different spells picked to be more thematic with what I want.