Here is one of my very favorite projects ever!! I originally read about these in a special issue Martha Stuart Holiday Handmade Gifts Magazine from 2006. These make great gifts, great decorations, and they're a great way to re-purpose your old Christmas cards!
Start by cutting circles out of old Christmas cards, about 1 1/4 inch in diameter. I actually have a large hole punch so it was pretty quick work, but in the past I've cut them out by hand and it's not so bad! You can also make really big ones by tracing around a glass to make your circles. Each ornament has 20 sides so you'll need 20 circles. That equals about two cards, unless you really mix it up and use lots of different designs.
Next, use your scissors to score an equilateral triangle into the back of each circle, with corners touching along the circumference. Fold the edges up on the front.
Now you're ready to build the ball! Start by gluing two circles together, points touching. Glue a total of five like this to create to the top - all tips touching in the center point like a star. Then glue five more together that will be the bottom. Just use regular glue but you'll need to hold each connection for a few seconds to be sure it stays put!
Next, glue 10 more circles together - side to side - with the tips alternating up and down. Connect them like a ring because this will be the middle.
Finally, glue your top and bottom to the middle. You can use a needle and thread to make a loop in it for hanging... or use a hole punch and add ribbon or yarn. I actually don't have a regular size hold punch. What's up with that??
Anyway, when when your Christmas Card Ornaments are dry, they will be so sturdy and last for years! You can hang them on your tree, tie them onto wrapped gifts, toss them around with your kids, or display several of them in a large vase or bowl. Try making themed ones by cutting out circles from only cards with trees or snowmen... or coordinate colors... or just use colored card stock if you want! I love these!