The circular items at the top of the drawing could be used for decorations.
Note the 10 stars, with 6 points, have a joined point that will let them be bent out of the flat tree surface.
The 10 circles each have 3 tabs, & are a size that could be inserted into the star openings as decorative ornaments, secured by bending the tabs.
See picture attached.
![Image](http://www.plasmaspider.com/images/Christmas-Tree-Decoration.jpg)