This really isn't a custom, but I finally put together my Star Wars Lego Chess Set. Some of the new sets, like Jedi Duel and Ewok Attack made it final. Here is what I have, and feel free to offer suggestions and criticism.
Rebels : King---Obi Wan (Landspeeder Set)
Queen---Luke Skywalker (Landspeeder Set)
Bishops---Han Solo (mini-fig pack w/Boba Fett)
Knights---Chewbacca (mini-fig pack w/Biker Scouts)
Rooks---C-3PO (Droid Escape set)
Pawns---4 R2-D2's and 4 Ewoks in alternating order
Imperials: King---Emperor (Jedi Duel)
Queen---Darth Vader (Jedi Duel)
Bishops---Royal Guards (Imperial Shuttle)
Knights---Imperial Officers (Jedi Duel)
Rooks---Boba Fett (mini-fig pack)
Pawns---4 Scout and 4 Storm Troopers
If anyone would like to try this, a regular "green grass base" will work perfectly. 4x4 squares will fit the 8 across 8 wide that you need for a chess board. It's kinda expensive to build, especially since I paid $35 for two Royal Guards, but they look cool. I would say I have $150-$175 in total, including paint and other things. I also glued everything on the figures, I got tired of the stormtrooper helmets coming off.