In June of 2005, Classic-Castle.com held a contest to create castle-themed chess pieces and chess sets. It looks like Flickr user astronut1 took his pictures a few months later (and just posted them on Flickr), but these would have been great entries:
The pawns are classic Crusaders and Black Falcons minifigs, but astronut1 created unique pieces for the rest. I especially like the kings and queens:
The rooks and bishops are also great:
