For reasons which escape me, Yamaha has a really nice webpage on paper crafts, which include patterns that you can download and build. These include not only cool motorcycles, but also animals like the Japanese macaque or the yellow-eyed penguin or the Cape penguin, pictured at right.
The patterns are all available as PDF files which you can download, print, cut and assemble. Neat! The motorcycles are especially well done, it's really incredible what you can do with paper models.