Last year I've made a mod for the classic low-poly Christmas Tree by idig3d, in order to insert some light I found at the local shop (Aldi in this case, but can be found also online).
The lights in this case are battery operated.
Due to the restrictions on the license of the original tree, I cannot include the modified stl of the christmas tree ,so, you will need to create by yourself a "modded" version of the original tree, completed with a base layer and a 57.6 mm fixing hole (for be able to insert it on the base).
All the STL for the other parts, are included in this release.
Few drops of super glue are required for joint the parts.