Yes bluestone, but not blue like wikianswers colour, more subtle tones than that (think glacier ice blue)
Dark blue and then add white and mix. If your blue gets to white,you have to start over. Just put a little white in,not much Hope I HELPED :)
I think it's called golden marrow. We used it overseas in iraq
turquoise
Periwinkle is more purple than any color. Another answer: Periwinkle is a shade of deep blue found in the colour of flowers called Periwinkles (Vinca major and Vinca minor). See also related link.