I haven't seen that but I have seen a version on my site with ads by google in the top left. Google is shown in their traditional font on top right corner of the banner , with in an area the same color as the boarder. At the end of the area with ads by google it angles up to terminate the boarder color with the corners being rounded. Below is a crude recreation. I did grab a screen shot that I can post to tinypic or image shack type places if its not against the TOS.