If you happen to have an android based phone, you can search in the marketplace for a Game Boy Color emulator. I know of two off the top of my head: GBCoid (3.49) and TigerGBC (Free.) I don't think there's much of a difference between the two except that GBCoid is updated a lot more often.
I play GBC roms on my Droid phone all the time and they run perfectly.