These LED bases from Amazon are good starters. Here is my first pass at something better. The attached template is to make your own to replace the black plastic housing. You can easily remove the internal LED board and battery plate and place them in the housing you make.
The green is there just to help visualize the project. I’ve noticed it’s hard to see in the interface sometimes. I set it to ignore when I run the project.
Correct, I added photos to another question below. So far I’ve done wood layered. Once I get more LED bases from Amazon, I’m considering a middle layer of acrylic to see how that works/looks.
If you’re going to make these in quantity, you can get the LED bases from AliExpress for just over $2. For a handful for friends or family, thought, the Amazon 4/$20 is certainly cheap enough.