If you get an orange (?) in your Christmas stocking, you can use the peel to make a pot to start seeds for your garden. To turn any citrus peel into a seedling pot you just need to poke a hole in the bottom of the peel for drainage, fill it with potting soil and add seeds and water.
Buy Nothing New weblog My Roman Apartment's author came up with the idea after losing her seed starting tray and having lots of leftover citrus peels. When the time comes to add the seedling to your garden you can even plant the citrus peel, but it's better to add it to your compost bin as it will take six-to-nine months to decompose and will add acidity to your soil.
Garden Hack: A Citrus Peel Starter Pot For Seedlings [My Roman Apartment via Re-Nest]