Google now has an AdWords display ad builder. It makes it possible for you to create what Google says are professional-looking display ads in AdWords without starting from scratch or hiring a designer.
According to Google:
You can also learn more here Google AdWords: Display Ads 101
According to Google:
Google has a video tutorialThis new tool lets you create customized display ads with your own text, images, and logo. You can also change colors and backgrounds. The tool can create ads to fit all possible placements across the Google content network, including video and game placements. The display ad builder is available now to all advertisers in the U.S. and Canada.
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/bU1oaWkXSHM&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/bU1oaWkXSHM&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>
You can also learn more here Google AdWords: Display Ads 101