I find that the bike that gets the most attention is my only carbon fiber bike; the ICAN Fat Bike. No ugly decoration, just a matte carbon frame, wheels, and handlebars. Add in the 4.8 inch tires and it looks like it is a lot of fun to ride in the snow, which it is! It seems to draw comments from 7-10 year old boys, along with the old guys who hang out on the streets in our downtown area. Hey, maybe its the Brooks saddle?
Next in line is the tandem, because two old people riding on that bike are just plain "cute". Add the paniers and put us away from home, and people seem to want to know who these people are that are bicycling through their part of the world.
My 1982 Peugeot CFX10? The one with Campagnolo group set and a Mavic Starfish crank? The only person who has ever mentioned it was a fellow who was riding by me on an old Klein. To most people it is just another bicycle.