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Cut apart a milk jug or other white plastics, clear plastic from product packaging and cut hearts in several sizes.
(I used all of the milk jug except for the handle, bottom and areas too curved or thick to work with)
Use a thumb tack, thick sewing needle, or pin to punch a hole big enough to fit a small size crochet hook through.
Using your choice of cord or thread, chain stitch 20 stitches between each plastic heart (20 worked best for me). Continue until you are out of hearts or have reached the desired length of the garland. You can trace the hearts on with premade patterns or cut them out freehand.
Source: My need to reduce garbage
For those of us who do not crochet, use yarn or baby ribbon, knotted on either side of the holes. And how about shapes for other holidays? Any simple shape would work- shamrocks, bells, stars, eggs, pumpkins, witch hats etc. They could have designs drawn on them with markers.
I really like the idea of yarn or ribbon knotted! Also if you didn't have a use for the garland.