I still have a lot of Game Boy games in my collection. They just kind of sit there, though. I could bust out the ol' Game Boy or one of the many other devices I have that plays them, but I'm lazy, and I want to see the games on my TV.
Yeah, yeah. Super Game Boy. Or! Or this device created by bunnyboy of the NintendoAge forums, called Retrovision. You plug this cart into your NES (not SNES!) and then stick in your Game Boy game and go. This even has the expansion port emulated so you can trade Pokemon or use the Game Boy Printer.
Blown up Barf Green comes at a price, though. The creator is selling these through the forum for $130. I like my Game Boy games, but that's a lot of cash.