This is a simple nightmare before Christmas Jack Skellington Head nightlight.
Uses this nightlight: https://amzn.to/2XMThg0
Print using clear filament: https://amzn.to/2XOC1Xx
Note this does NOT fit the nightlights from the dollar store as they are slightly smaller, and also the dollar store ones are dim junk.
Printed using minimal infill, 0.2 layer height max, ~3 perimeters all sides. Presses snugly onto nightlight with about 5 seconds from a heatgun to encourage it.