There are a lot of crafty sites out there that use card fronts! Here's one of the top of my head:
What you need:
3 Christmas cards
a circle to trace
pencil
scissors
glue, probably a hot glue gun
ribbon, yarn or string
hole punch
First trace the prettiest section of the card with your circle. Then cut out the circle. The size doesn't matter as long as they are all the same.
Decide what will be the top. Punch a hole.
Next, bend each side of the circle, just a small section, about 1/4" to 1/2" from back to front.
Glue the bent portions to each other, creating a triangle. If you aren't using a hot glue gun, you may want to paper clip the sections until they dry.
After the glue is dry, thread you ribbon through the holes. You can make this part as fancy as you want.
Done! YOu have a pretty ornament for the tree, mantle or something to add to a wreath.
Enjoy!
Feel free to ask if this need clarification.