Google Search Capability
As I understand it, the Google Engine’s search capability is basically dependent on its recognition of typewritten symbols - letters and numbers. This might sometimes lead to certain limitations. For example, if Google searches a site that contains untitled abstract artworks, it will recognize (due to image file codes) that images are there. But it is highly unlikely that a random person out there who is surfing the net would be able to use search and thus randomly stumble across the same untitled abstract images.
I wonder then if Google spiders would find it advantageous to start crawling sites not only for letter and number combinations but also for colors. This shouldn’t be too hard, I would think. I can use a free download called colorpic to match any color with a specific code. If the google search spiders ‘read’ sites and images for colors as well and matched those colors with numeric color codes, it could be interesting to do a search for them and see what comes up. If Google and other search engines worked this way, it would be interesting to see what the top site would be for “Red” or “Black” or maybe “Red and black” … that sort of thing.
Perhaps a service could also exist so that a host could analyze his/her site or image for colors and put the color names or numeric codes as tags, making it easier for sites like google and technorati to pick them up for search.
Just some random thoughts.

There was a Slashdot on image search by element recognition instead of text recognition:
http://slashdot.org/article.pl?sid=05/05/04/2239224
A story on shape recognition searching:
http://slashdot.org/article.pl?sid=02/11/03/2313208
Jeremy
P.S. sorry for not formatting links
That’s would be a somewhat cool idea. One thing to note, though, is that rarely is there a site with untitled artwork. Most art has a title and if not the web designer will at least through in some keywords like “abstract art, untitled” :-). Also, I never want art that is black or green, I want art that is good. So just searching for a certain color of artwork isn’t very useful. I could, however, see this application in products, especially clothing products. For example I want to shop for some green shoes or a blue shirt. Become.com has recently introduced a feature like this into their shopping program called the color search (http://www.become.com/colorsearch.html). It looks very useful.