Yes, those mashed potatoes are blue. They actually started out purple, but by the time I cooked them and mashed them, they were blue. The accompanying bit of meatloaf is there as a color reference. It's normal meat-loaf color.
So, yeah, I bought some purple potatoes just for the fun of it. I've done it before, when the boys were little, but that was a long time ago. Although they tasted like potatoes, they were just too blue for me, and apparently for everyone else who usually makes quick work of leftovers. We ended up throwing them away.
Makes me wanna get some Play Doh, though.