I wanna find a non standard color to put a malkoff xpg2 into
Any storefront place, including physical stores, are just going to sell the same common colors; you'll have to check EBay or CPFMarketplace for past unique offerings. And don't forget the world of custom machinists who make all kinds of fun Mag bits and pieces; Mac's Customs, Fivemega, etc. There's also the option of getting a host and taking it to a powdercoating shop, which makes possible any color, finish, design, etc..
I'm comfortable with silver since that's the [non-]color that doesn't show scratches and is really visible.