[Princeton]

1)__ remove the black 'bar' on the header -- it looks cheesy
2)__ change the statusicons (and some others) -- it looks identical to what we have here
3)__ change the background image on tcat, etc -- create your own image
4)__ make sure you are not using code (html source code) found here

When you do all of the above you can claim it as your own.

With that said, I don't know why you would want your site to look like another site.

An "idea" cannot be copyrighted ... you can only protect how the idea is used or put into practice.
If an "idea" could be copyrighted, we would all be drinking Coca-Cola and driving Fords.