Similar shades: Bare Escentuals' Surprise (but this color is a bit deeper in hue, and more pigmented)
This color looks so close to my mom's all-time favorite periwinkle color. She's not as fond of shimmer and sparkle, but I'll have to convince her that she can make it work. (Wait a minute…what am I talking about? I don't want her raiding my stash!!!)