Patent Searching on Google
Google has simplified patent searching. Go to http://www.google.com/patents to see. If you're just looking for pretty pictures, use the phrase "ornamental design" as part of your query. For example, "jet airplane ornamental design" will pull up many patents with line drawings of jet aircraft. These images are all copyright free. The only drawback to google is that the documents they present are fairly low resolution at 72 d.p.i. For the high quality original (300 d.p.i. .tiff files) go to http://www.uspto.gov/patft/index.html the USPTO website after you've located your patent.
Happy searching.