The American style light switches have so many cool rental-friendly covers/frame. I wanted to show some love to the Europian style (80x80 mm), as well. Simple decorative project if you want to used up the rest of your filaments. The thin version has 1.5 mm overall height (5,14 g), the regular version has 3 mm overall height (10,31 g). It fits quite snuggly around the light switch, but if you like more secure attachment I would used a double-sided adhesive tape in the corners.

For the example in the photos I have used Prusament Chalky Blue and Terracotta PETG and Prusament White PLA and Auropol Metalic Blue PLA. I have added colour change in the Prusaslicer.

15% infill