All you need is a heart paper punch, some paper and a sewing machine.
Cut out the hearts, put two together and run through the sewing machine, repeat.Then fold the hearts out (for more visual interest, vary the sizes and paper types) . Hang. They move and spin in the slightest breeze. Stick some bare branches in a vase or champagne bucket, using foam to secure them and hang dozens of heart strands from them for a spectacular display.
The hearts here haven't been folded open yet because they will be easier to transport in their closed position. I'll take another photo when they are situated at the party at work.