EDID fuzzer, EDID sniffer & Monitor/TV screen i2c addr scanner :)

or try building a canvas pixl.js screen emulator ?

The Pixl just offers a global variable called g for graphics... If you just do something like http://www.espruino.com/Pico+LCD+Hello+W­orld before you call your code then you're basically there with emulation :)

I2C slave

Do you think having the slave implemented as a bunch of registers would actually work in this case?