Garnering repeat visitors is key to the sucess of your business website. One way to encourage that is to personalize the website to each individual visitor. Amazon does a great job of this with their recommendations. However, it doesn't have to be that complex. Sometimes something as simple as giving each visitor the ability to modify your website color scheme will enhance their visit.
In this minor demo, you can do just that to our website. What color would you like the background to be? What color should the text be? The power is in your hands. I would recomend that you do not set the text and background colors to be the same thing, it's rather difficult to read anything that way.