Here’s a helpful post from Savvy Sugar:
If you enjoy making cups of coffee for yourself at home, then you’ll find yourself with an endless supply of old coffee grounds. It’s best to not let them all go to waste. Here are a couple things you can do to recycle used coffee grounds:
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Beauty scrub: Mix honey with coffee grounds to create a scrub that you can use for your face or body to keep your skin feeling smooth and to help it glow. The scrub is also said to reduce cellulite on your body.
Hair mask: Rub the grounds into your hair before shampooing and conditioning. Leave them in for a while before washing out, and your hair will be glossy and shiny. You might want to avoid using this mask on light-colored hair.
Fertilizer: Add the coffee grounds to soil and they will act as fertilizer. You can also mix warm water with the grounds then use the mixture as a fertilizing spray or feed some of the it to your house plants. Coffee grounds will be a good addition to compost, as well, since they are very rich in nutrients.
Deodorizer: Put coffee grounds in a bowl and place it in a room in your house or your refrigerator if there’s a lingering odor you want to get rid of. You can even rub your hands with the grounds to get rid of any smell on your skin, or you can dump some in your trash can to minimize the smell of the garbage.
Furniture stainer: Mix coffee grounds with warm water and rub the mixture over the scratches on your wooden furniture. Then wipe the mixture off after letting it sit for a while. The coffee stain will help to cover up the scratches.
Cleaner: Use coffee grounds to clean things like your pots and pans when they are extremely dirty. Scrub the surface with the grounds and make sure whatever you’re cleaning won’t get stained by the coffee.
Insect repellent: Sprinkle coffee grounds around the areas where you don’t want bugs. Insects are repelled by the strong smell of the grounds.
Soap: Since coffee is a good deodorizer, it makes sense to have it as an ingredient in a soap — particularly if you’re fond of the scent. Make your own coffee soap with this recipe.