Place a few drops of essential oil (one pinner suggested lemongrass scent) onto the cardboard tube of your toilet paper roll to make your bathroom smell good. Not sure how well it works but it sounds like a good idea.
Are your keys looking boring. Paint them with nail polish. This is a great idea because when you wanna change the color simply use nail polish remover and then you can do another color. It costs less then going to get your keys colred or designed.