I once owned a NES cartridge that you slid your gameboy cartridge into. Then you could play with some color. It was a device similar to the Game Genie. It was basically a converter of sorts. I've forgetten the name of the cartridge, but I'm sure a quick internet search would find it. You could possibly find a ROM for the converter and use it?
I think that cart you are talking about is a Super Gameboy add-on. I thought I saw some forum post about running palette swaps through it, but it doesn't seem like a 'baked in' solution like some of these other hacks. Someone else said, if you have to ask, you're not up to the technical challenge of performing a color hack -_- So, I don't know - maybe I'll just remake the game in some software I already have without Gameboy hardware emulation limitations.
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