I'm willing to bet anything made by Lancia would be a great candidate. A "white elephant" gift exchange revolves around exchanging outrageous spite gifts that are difficult to get rid of and for which there are exorbitant costs of ownership.
The idea originates with an account involving the King of Siam, who supposedly gifted rare, albino elephants to those who displeased him in the hopes that the costs of keeping the beasts would be their ruin.
Drop your ideas in the comments below. To summarize, the criteria are (1) extravagant, (2) difficult to dispose of, and (3) expensive to own.
Image credit: Tennen-Gas, released under Creative Commons