io9 has pictures of 26 wedding cake toppers that geeks would enjoy, including Star Wars, Transformers, Stargate, Back to the Future, and zombie themes.
io9 uses the term "nerdiest", but I pefer to be addressed as "geek". The origin of the term -- someone who would bite off the heads of chickens at carnival sideshows -- seems a bit more fitting.
Link
Previously on Neatorama: Steampunk Robot and Other Weird Wedding Cake Toppers