The first and easiest way is to simply replace your existing doors and drawer fronts without doing anything at all to the boxes. If they are a wood grain you don't even have to have an exact match. Take a close look at your cabinets now. You'll see that typically you have areas that are both lighter and darker than each other. A light to medium oak door will work just fine in almost every case. A slight contrast can add interest. Invoke a warm, modern look by installing the very popular almond or white euro style door with continuous oak rail pulls and hidden hinges on your existing boxes.