I really enjoyed https://www.thingiverse.com/thing:3310601 as a tree topper that was posted a couple years back. I had used it as my tree topper for a couple years, but always felt like something was missing. I realized what was missing was that it was a dark object at the top of my otherwise lit tree.
So I made a few tweaks to the model so I could incorporate some LEDs:
I powered the LEDs with an https://www.adafruit.com/product/3500
The LEDs were set up such that the Neopixel Jewel was on the bottom, and I had wires running up one of the spokes of the Tree Topper to the middle level where the Neopixel mini button is. I tried to hollow out one of the spokes to hide the wires completely, but I kept messing that up, so I skipped that for now.
Source code for LEDs: https://github.com/techfreek/tree-topper/tree/main
The author remixed this model.