The modder LeggoMyFroggo (aka Chris) recently released an entirely open source project called the Frog Boy Color. This project is a completely original design that reimagines the Game Boy Color as a horizontal form factor handheld in much the same vein as a Game Boy Advance.
This project requires the removal of several unique components from a donor Game Boy Color console such as the CPU, RAM, Crystal, Cartridge Connector, and the Link Port Connector. Once they are removed you need to install them onto the Frog Boy’s custom designed motherboard.