I am pleased that you asked that question, Ken Anderson. As a matter of fact, you can. If you look at near the bottom of the page, on the left side, just above the footer, you will see two choices: Ad Styler and Color Options. I have not yet played with the Ad Styler myself yet, but I did notice that there appears to be an option to return to the default styles if you don't like the results of whatever you may have done. The Color Options are a little more clear cut, allowing you to choose from a few preset color combinations. These choices will change the experience for yourself alone, so you won't be changing anything for anyone else.
Now that is pretty cool. I just saw the Ad Styler at the bottom of the page and I am off to play with it a bit. Its nice to know I'm not affecting anyone else's view when I try a new setting