Ahh, the infamous Sugarpill Lumi. It definitely lives up to the hype, just in case you were wondering. 🙂 From the Sugarpill website:
Snow white with turquoise sheen and flashing bursts of blue and green. When worn over a dark base, this complex white transforms itself into your new favorite blue eyeshadow.
In the pictures below left to right are: Lumi alone. Over NYX Jumbo Eye Pencil in Milk. Over NYX Jumbo Eye Pencil in Black Bean.