What happened to the Seven Dwarven Rings?
 

What happened to the Seven Rings given to the Dwarves in there Halls? I've heard that they were recovered by Sauron, that they were consumed by dragons, and I believe that Thorin possessed one. Perhaps it was a combination of the above? Seems interesting to me.

some were consumed by the dragons, soem were reatrieved by sauron. Even though it was believed that Thror had one later proven that he did not, there for Thorin did not have one either.

Thror did have a Ring, the chief of the Seven, which he passed to Thrain his son. But it was taken from him in the dungeons of the Necromancer and so did not pass to Thorin.

Three Sauron recovered; the other four were destroyed by dragon-fire. Thror had a Ring (as Morwen Tindomerel said), which was one of the three that Sauron recovered. He offered them to the dwarves in return for an alliance in the War of the Ring. Obviously, the dwarves refused. No one knows what happened to the Rings after the downfall of Barad-dûr; they were probably destroyed in its fall. They would've been worthless had they survived, anyway.

On the Dwarven rings, does anyone know whether one ring was given to each of the ancient houses of the Dwarves?

If so that may mean that there were three rings in Moria originally, one for Durin's kindred, and one each for the dwarves of Nogrod and Belegost who had fled there after their homes in the Ered Luin were destroyed during the War of Wrath. Perhaps this is one of the reasons that Balin went back to Moria, as someone should really have told him that Thrain's ring was lost to Sauron.

The other four would then have gone to the Eastern dwarves, who don't come into the tales much apart from sending reinforcements to the 3rd Age War of the Dwarves and Orcs. I guess at least some of the Eastern dwarves were ensnared by Sauron as at the end of the second age its implied that some dwarves did indeed fight for him.