It's not black, that's the Bead Blast version. Granted it is even darker than my Bead Blasted HD-7.
I actually took 220 grit sandpaper to my bead blasted HD-7 to smooth it up. It was dragging on my pocket when I would pull it out. Also rounded off some sharp spots. Not as pretty as it was, but it feels better in hand.
Yes Titanium can be anodized different colors. Not sure what the colors are or the process to go about getting it done is though. I'd like to have the Titanium done like the Titanium on Strider's SMF/SnGs, I think it would look very good.