Beautiful cards, I've been toying with the same kind of project of paper for a while now. I came up with an idea to have a key word "Burglar" replace the Ring-Bearer and various versions of Bilbo's contract to replace The One Ring. Then I drew up The One Ring as an artifact that made Bilbo into a ring bearer. Of course The One Ring would need to really power up Bilbo to justify making him into the Ring Bearer.
Thanks! I wish I had time to work on these... I haven't made a card in over a year!
I have a project on facebook for Axis and Allies: War at Sea that's meeting the same fate.