Google Image Search is useful, but depending on your search terms, might require tremendous sifting through extraneous images.
Now there’s Swirl … enter a key word and get a screen with example images. It being that time of year, I entered the word “turkey.”
Choose the image that represents the concept closest to the one you want (choosing the Thanksgiving turkey, rather than the map of Turkey). Now you’ll get a concept map like this:
You can then explore any subgroup in the cluster. It’s a pretty nice way of searching for images.
More on Swirl at the Official Google Blog.