Where can a photo of PCV valves be found on the Internet?

Photos of most anything can be found using google. Just go here: http://images.google.com/ Then type what you're looking for. In your case "PCV valve". Put both words in double quotes to avoid hits on just PCV or just valves. Once you're searched, you can select the image size. I find selecting "Large Images" usually yeilds the best photos - better resolution and better imagages since they are likely to be real photos not just small icons, etc.