From what I understand, Rial only makes two color variations of the wheel and these are it. Not sure why TireRack did not use the same color names as TuneShop. I asked TireRack for pics but they don't have any until they actually receive the tire and take their own pics.
The ones you see above are called "diamond black".
There are several more. Here's graphite:
Here's the Milano wheels in the titanium (to get a color sense):
What's unclear is whether the titanium is going to be like the black or the graphite, where the leading edge is silver but the "fan blades" are titanium, or whether it's a solid 1 color.