No special electronic region, or sound/video mods, just a paint job. I used black, and gray vinyl dye. Just showing off. ;)
(http://i231.photobucket.com/albums/ee171/bcforn64/SNES%20Mods/snes_vinylDye.jpg)
Man, I just love this. I'm definitely going to do a similar thing to make my SNES not look so out of place with my gamecube and N64. And now I know to use vinyl dye!