From the same developer of Sega Gamegear emulator , here comes the Nintendo GameBoy emulator for Windows Phone. This initial release has no sound,but like Blue Tomatoe, Purple Cherry will be getting sound emulation in the near future. Stay tuned as we'll keep you posted.
Here is video of the emulator, courtesy of our colleagues from WPCentral:
The GameBoy emulator has a price tag of $1.29 and can be downloaded from the WP Marketplace