Old - I'm with One Horse Town here: the Dragon Warriors paperbacks.

New - Savage Worlds Explorers Edition

Borrowed - The bunko edition of Arianrhod. But I'm just holding it hostage for my Engel rulebook that I gave away in exchange. (Btw, last month I bought my own copy of Arianrhod, both the bunko and the big version.)

Blue - The Complete Gamemaster Series 1: Halls of the Dwarven Kings