If you’ve ever needed to find a “similar looking” image, you will know that text search is not really useful. This is when Google’s Image Search becomes handy.
Go to www.google.com/imghp and click the little camera on the right of the search box, then either put in a URL of an image or upload an image. Google will then help you find similar looking images.
I’ve put in the link of one of my portrait photo where I’m wearing a black shirt and I got back a whole bunch of search results filled with portraits of people wearing black shirts.
Very useful for designers, bored people, people who love Google, people who have nothing better to do, people who need to be distracted from the important things they are currently doing.