There's a shang glitch involving morphing to Jade and doing her projectile protection just before she morphs back to Shang that lets you do some very funny pallet swaps, but I forget if there is anything else to it.

Best way to do it, morph to Jade, duck for about 8 seconds or count 11 cycles of her stance I believe it is, perform the PP just before she morphs back, and as the morph back happens, I think you need to do an attack, like a ducking LK, you might not have to as it could be random or some kind of random variable including exactly when you do the PP before the morph. After the attack Shang will stay with Jade's palette. They seem to have corresponding color schemes. To get other characters to look weird, morph into anyone during the flashing. I think the flash has to end after the morph.

Whoops, I forgot to mention I was talking about MK2.Sorry.

I don't know of a MAME cheat, but I do know of a cheat for SNES.

talk with AceKombat, i think he has what you need

Ok, I'll try and see if he has it.