At the beginning of each round, any player may suggest an analogy. The analogy should be of the form "What is the ______ of ______ ?" For example, "What is the Texas of Europe?", or "What is the Model-T of the Animal Kingdom?"
Everyone secretly comes up with an answer to the analogy. When everyone's ready, each player says his or her answer in turn. (Use the honor system to keep people from changing their answers.) You get a point for each other player who came up with the same answer you did.
Play until someone reaches a pre-determined score. Or just play for fun.
For some truly wacky analogy questions, have two players each come up with a random word, and then combine the two words to form the analogy.