12 toilet paper roll tubes
red & green paints
For half of the tubes paint the inside red & the outside green. Reverse for the other half.
Use one of the colors to be the "big ring" and one to be the "small ring". The small ring uses 5 stars & the big ring uses 7 stars.
Glue the small ring on top of the big ring. Also, clear nylon thread can be used for reinforcement.
Take a piece of ribbon or sting & hand on your door.