Are you looking for a solid image search? xcavator might be able to help as it offers a couple of interesting image search options. Unlike other image search engines, xcavator enables users to search stock images by selecting an image color, tag or keyword.
Using an innovative color selector users can find images with a similar dominant color. The color selected can then be filtered by tag or keyword. Users can search among royalty free and licensed images. Additionally, xcavator uses image recognition technology which was created by CogniSign to allow users to search on an uploaded image. Check out the video tour here - a screen-shot of a simple color search is shown below.