Every year I make tree ornaments for my neighbors and earrings for my other friends. These are the earrings for 2020. They are lit with these little lights I found on Amazon:
https://smile.amazon.com/gp/product/B0751CHFNN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I also used some beads I had from my earlier incarnation as a beader.

Print instructions

The plain bulbs and those with little square holes can be printed with no support, but a brim is advisable. I used supports on the other models. Transparent PLA and PETG work well. The green PLA (Prusament PLA Opal Green) and the white PETG (generic) are somewhat opaque but light still shines through. The diffuser is necessary when using transparent filament because the light from the LEDs is too harsh without it. The diffuser is printed in vase mode with an opaque white filament.