If my memory doesn't fail me...
1T Elmer's Glue
The cookie-cutters were great, and we just used the end of a paint-brush stick to make the hole at the top. Of course, I strung the thread through - but this is going to be a wonderful add-on to gifts this year. The original idea came from my lovely past teaching assistant named Cindy. She always said this would be a perfect classroom, Christmas gift - I sure do miss Cindy.