If you don't know the awesome resource pack, Conquest, check it out here:
http://www.planetminecraft.com/texture_ ... est-32x32/

I myself have already managed to create quite the load of models for this pack:
http://www.planetminecraft.com/texture_ ... ack-addon/

And yes, this is going to become the official add on pack, I talked to Monsterfish_ (original pack creator) about it.

The rest is obvious, if you have some models you want to contribute, send me a download link so I can try them and add you to the wall of Contributers.
If you want to make models, I suggest Cubik Pro for easier creation than coding by hand.