A huge number of posts about corner breakfast nook
Of course you will want to design your breakfast nook with the overall theme of your home in mind. A god start would be to utilize similar furniture and fixings, and simply use a related but different color for the walls. This will allow you to retain your overall design vision, while still having a breakfast nook that is its own unique space. Speaking of space, make sure that your breakfast nook is comfortable and useful, regardless of how little space you have. For smaller spaces, you will probably get better results by using a diner style bench or booth that is set flush against the wall.