We always like the new uses for old things they come up with over at Real Simple, and this one would be a great way to use those glow in the dark stars that aren't quite as thrilling anymore on their ceiling.
Create a lit path in the hallway to the bathroom with the stars in a line or scattered about on the lower part of the walls. If you have a neutral wall color, you shouldn't really see them during the day, but it adds that touch of whimsy at night.
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(Image: Aimee Herring)