The virtual boy is the only old Nintendo console I have never owned and heres a new demo released for it:
Howdy there, would you like some dinosaur on your Virtual Boy?
StereoBoy has released a brand new homebrew he has been working on recently with Jorgeche and me. "DaumenKinosaurier - VUEdition" is a Virtual Boy port of an awarded stereoscopic flip book StereoBoy made as a student in 2009, realized in the VUEngine.
More information about the project, ROM download as well as sources can be be found in the release thread.