It would be a copyright, not a patent (but the idea is understood :) ). It really wouldn't be worth getting a copyright though, because if something sells well enough, there will be knock-offs, copyright or not, and the companies that do knock-offs know that average Joe's aren't going to go through the time and expense of suing them, so it's best to hit the market hard and sell as many of something you can before knock-offs start showing up.