PSOne Mods
They are really small but you could dremel a window in the lid, or spray paint it a radioactive color, a couple of really bright LEDs and a fan would look way cool.
I dont think he wanted to alter the apearanc, but more to mod the hardware.
Try looking here...
You will probably need to actually install a MOD chip for your PSOne, for the things you'll want to do with it.
There are other alternatives too (like the "spring" trick), but they end up being more of a hassle.
you could do software, region and BIOS mods on a PSone... but It'd be a severe pain in the ass... Just wait till you pop the top. all those solders are going to be tiny as all get out. I'd almost say you'd need a microscope at some points just to see what you are doing.