Delicious to eat, basil also repels mosquitoes and houseflies. Place containers of basil around outdoor areas where you like to relax. You can even use it to make your own natural insect repellent by pouring four ounces of boiling water into a container with a generous handful of leaves and stems. Let the mixture steep for several hours, strain, and then add four ounces of cheap vodka. Pour the mix into a spray bottle to spritz on whenever you're outdoors.