Star Trek: TOS - The exhaust pipes could be shaped like the nacelles of the original Enterprise and the gas tank could be shaped like the Enterprise logo. You could also have the Enterprise logo intergrated into the rims.
Star Wars - Exhuast pipes could be extended light sabers and the gas tank would be shaped like the Imperial Star Destroyer. You could have an R2D2 carb like the fire hydrant one on the FDNY bike.
The Matrix… you get the idea.
Moving this to Cafe Society.
Oh, and Knight Rider. 
I would love to see a Big, oversized Juggernaut (from Marvel Comics) themed bike!
2500cc La-Z-Boy!
A renaissance themed bike would be interesting…
I’d like to see a tribute to “Mad Max” bike. It would come complete with rifle mount in a perfect world. It would also come with a skull mounted in the front with its opend mouth as the headlight. (and beedy l.e.d. red eyes.)
Or a “Tron” bike with lots of neon and black light ground effects. (or you could call it a futuristic bike I guess.) Fix the wheels with neon too so when the bike is going down the road you’d get that cool tracer effect as well.
Hooters bike. [shrugs shoulders] what the hell I like Hooters.
I’d like them to do a totally feminine bike. Something completely different from anything they’ve done before.
They could have exhaust pipes shaped like lipstick tubes, satin upholstery on the seat, the pegs could somehow be like high-heeled shoes. The bike itself would be very curvy. The tassle thingies on the handlebars could be sparkly. There’s a lot you could do…not all women who ride are hard-ass chicks. Yes, it’s novelty, but so are all the other bikes they do.
I’d like to see a Mary Kay chopper.
The gas tank could look like an overstuffed cosmetic bag and the exhaust pipes could look like a couple of eye liner pencils. Saddlebags would be lined with lace, the wheelie bar would have a “Ride Slow, Die Old” logo and the entire thing would be in Pepto Bismol pink.
One of the male enhancement pills like Levitra or Viagra. If they are on NASCAR . . .
How about for the movie “Anger Management” on DVD?
Seriously though:
A Transformers bike. That would rock.
