Designed these for a friend that wanted solar lights at their camp to look like mushrooms and do a fairy circle or similar. Other mushroom solar lights had connecting wires which they were concerned about tripping hazards

These 'hats' are design to slip over these solar lights: https://www.amazon.com/dp/B01K1SETD4 after removing the decorative metal ring. They could also easily be scaled to fit lights of different sizes

Two versions are included.
The one is a standard "Button Cap" mushroom style. The colors were hand painted on with acrylics and then sealed with a clearcoat. You could also custom paint it in slicer if you have a multifilament setup
Other is closer to a "Morel" type mushroom. Intended to be printed with clear or semitransparent filament. In the example photos I have some in glow in the dark and clear PETG. I then used some thinned brown acrylic paint to add the colorations

Bambu Lab

PETG