Cae and I made window stars with waxed kite paper. Below is a "how to" with Cae doing the demo. They are easy and beautiful and look lovely in a window that gets loads of sunshine. You can get the paper at "A Child's Dream" the size we got was $5.90 for 100 sheets, well worth the money. I recommend get a few booklets full as each large star takes 8 sheets (the size we made) but you can use two small sheets to make smaller stars.
Good luck and have fun!