He didn't use a picture frame LCD, that was just a question I had in theory. That if a picture fram LCD had AV in, could it be used. He simply replied stating that he owns an LCD picture frame with AV in.
You could make one for an original xbox, you would need an original xbox wireless controller, a screen, the wireless transmitter, batteries and the other parts to make it all work. Since all it does is trasmit the AV signal, and the controller signals, you could theoretically make one of these for any system that has composite AV out and a wireless controller. You could also do it with a wired controller, but then you could only stray from the system as long as the cable is. I wouldn't recommend making one for a Wii though, you may throw it through a window or something
I am still waiting for someone to buy this from him, that we he will make another one with instructions (please!) and hopefully the next one he makes is for the Xbox 360.