Ever wonder if you can reuse cardboard egg cartons? There are myriad craft ideas online, but if you’re not crafty, you can still divert them from the trash. One thing to do is save them and use them as packing filler when you’re shipping items. Empty space in shipping boxes is a big no-no when mailing things, and the stiff but lightweight cartons are great to fill up space and protect the box's contents. You can also save cartons and bring them to neighbors who sell eggs or to local farmers markets; they’ll gladly take them and reuse them for eggs. And of course the easiest of all: Tear your cartons into small pieces and add them to your compost bin. They will break down into beneficial mulch.