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As a member of the "blue group" in evo2009pdi I was looking for a visual search tool for Flickr and came across tiltomo.com -- like the fact that it provides for searching by colour and texture. Of course an important consideration in the use of any image is the licensing of same. What rights have been reserved by the photographer? Have to check regarding licensing of content linked. Creative Commons http://creativecommons.org provides a series of licenses for "producers" to clearly outline the "if, how, when, and where" the "art" they have produced may be used on the web.