Big spiral Christmas trees are easy to buy. Small ones, hard to find. So, I made this spiral tree so I can 3D print a new one whenever I want.
This is customizable, but beware: the object takes forever to update. This is because OpenSCAD does not have a spiral primitive, so I had to make the spiral myself.

What I do with the trees is then take a small strand of battery-powered lights, which are available from a variety of sources, and wrap the spiral with the lights. This is very labor-intensive. Once that's done, I get a small piece of wood, a stick (I use wooden kebab skewers), and turn it into a tree.

I had no idea what category this should fall under.