I made some really simple star bunting for the shop yesterday using lining paper, garden string, a star shape punch and a stapler. I have wrapped it around a vintage metal candelabra with some painted pine cones and it looks lovely.
Here are a few (maybe more professionally made) paper star decorations from Etsy.
You can find it from Alexa Shop here
You can find it from Pierrette For Kids here
You can find it from Jen Ramey Designs here
You can find it from Paper Notebook here
You can find it at The Path Less Travelled here
Decorate Decorate 
Your “tree” looks great (I love a non-traditional tree) and I love those stars made from old book pages