If you need an image with a particular colour whether for a web page or just to hand on your colour-co-ordinated wall then this site is the place to go. It may sound a bit odd but you'll be there for ages trying different combinations of colours and seeing what comes up.
Images from Creative Commons places like Flickr and others are searched and those that have a prominent proportion of the exact colour you seek are presented in an attractive grid. Collect them and enjoy!