1. Now I don't have this problem since I love cats, but I know of plenty of people that will go to extreme lengths to keep them out of their gardens. Some deterrents like the high pitch squealing boxes can be expensive, so why not just use orange peel? Or any citrus peel to be exact. Thats right, cats hate the smell of citrus meaning that chopping up some peel and sprinkling it over the garden can theoretically create a barrier and deterrent for any invading felines. This also works with certain insects as well.
2. Candied Orange Peel. This is a delicious little snack if done right even though it can be a little time consuming. Take the peel from any oranges, remove the pith (the white bit) and place in a pot of boiling water for 15 minutes. Drain, rinses and then drain again. Bring 3 cups of sugar and 3 cups of water to the boil in a pan over a medium heat. Stir until the sugar is dissolved. Bring back to the boil and simmer until the peel is very soft, about 45 minutes. Drain then toss peels with a cup of sugar and place on some baking paper until the coating is dry, around 1-2 days.
3. Healthy Fragrances. Simmer the peels in some water, add a pinch or two of cloves and a cinnamon stick. You can then place it in a bowl and you have yourself a fragrance that will actually kill off any airborne cold or flu, perfect for the winter months.
Now you have a few more ideas then letting those peels go to waste. So until next time bros, carry on cooking.