Cut a whole pile of paper hearts. Then just stitch them together.
(set your sewing machine to the longest stitch, leave a long tail at the end to hang the garland later, and sew right down the center.)
SOOOO QUICK and EASY!
My 5 year old helped me cut the hearts, he colored some, signed his name on others, let his little sister add some scribbles.
(Instead of names or scribbles, maybe little love notes?)