Using Multicolor Search tool you can look for matching colours instead of subject. By means of a colour palette you can determine which colours you want and you'll immediately get a selection of images."Multicolor Search Lab is developed by the Canadian visual search software developer Idée Inc. Their tools are sold to companies like Associated Press, Agence France–Press and Digg, but you can use them for free on Flickr’s database".
Future Vision by Erwin Van Lun on this article
Currently limited to a few colours, but later on you can search exactly for those colours you want. Later on you’ll just have a megascreen on the wall and say “I want something like that, but then with people” or “Those people are all right, but now laughing or with animals”. You’ll get it exactly how you want it, but typing won’t be part of it anymore. This form of visual searching fits man really well.