Google has a new way to search for images. You can search for similar images instead of using words. The site is very easy to use and the results are very good.
You can do your own search or search for images similar to example images that Google provides.
On the start page, I clicked on a picture of the shuttle launching and got a huge number of results, including many that were exactly the same picture, but on different sites. There were also a lot of variations of a shuttle launch.
I did a search for "helicopter" and it came up with a large number of images. I then clicked on the similar images link under a picture of a helicopter that I liked and got a great return of images.
Google Similar Images is very easy to use and is a great new way to search the web for images.