Glue three bottles around the center 3-inch hole for stability.
Arrange the Christmas tree lights around bottles in center (it's a good idea to tape them down) with plug trailing off the disk on the side that will be the back of the tree.
Glue the bottles around the edge of disk in a complete circle. Determine how far in the bottles should be placed by using the next disk as guide. The bottles on the base will be the support for the next disk, and so on.
Place the next disk on top of ring of bottles.
Pull the Christmas tree lights up through the center hole.
Repeat until you use all of your disks and reach the top of the tree.
This tree will be fragile, so be extra careful if you have young children or pets. Make sure the glue you use if not flammable.