What you need:
Glow in the dark sandart (purchase here)
Step by step:
Remove non outline section of the cardboard and sprinkle sand onto the exposed sticky surface.
Repeat the process for all section except some areas for glow in the dark sand.
Finally sprinkle remaining sections with glow in the dark sand.
Final result, this picture is taken in a day light. Put this piece into a dark room and you will see how it glows amazingly!