I’m hoping a Maker out there might consider check this out (and take pictures)- this site offers a GUI, console and source versions of a tool to change the graphics in the navigation system in Acura/Hondas. The trick seems to be to know the special codes to display the BIN files in your nav system, pop out the DVD, make a new one, mod the files and then hit some codes to have the car take the new graphics. This also seems to open up a lot of other hacks and mods if you can change other things. Link.
Mod your Honda/Acura Navigation System