First thing that came to mind with this challenge was a lighted egg with the shadow of whatever is inside showing through, so...tada.
Process:
Cut out "access hole" in egg with dremel and drained the egg
Cut small blob like thing out of black construction paper, put a small amount of adhesive on it and stuck it inside the egg.
Inserted a plain white christmas lite inside through the sheet and up into the egg. Hid the remaining lights with the remaining black construction paper.
Cropped and adjusted levels.
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