I've done a little MMC5 demo that shows a fulscreen picture of my cat with ExGrafix mode, and adittionally, all VRAM writes are done with the screen on (exept for clearing the screen).
You can compare the NES picture with the original JPEG file
http://jonathan.microclub.ch/cat/
It loks nice, but this hasn't be tested on the real hardware trough.
Fulscreen ExGrafix
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Fulscreen ExGrafix
Useless, lumbering half-wits don't scare us.