Arcade1Up recently released a series of mini plug-and-play consoles, and they appear to be solid emulation devices (granted their controllers could be better). I felt the console itself could be a bit more fun so I redesigned it to look like an Insert Coin slot from an arcade machine.
I just turned their console on its side and moved the power button, everything is still aligned to a single PCB board. The only major addition is an internal LED light.
Dave's Geeky Ideas 