Google have enhanced their image search functionality this week with the inclusion of a colour selection option which filters the image search results based on the colour you select. It should be a useful little enhancement for filtering the results displayed in Google image search as it will enable you to source images which fit the colour scheme of a particular document. These are the sort of enhancements which I believe we will see more of in the fight for search engine supremacy (if anyone decides to put up a real fight anytime soon!). Every major player should have the basis of a solid search algortihm nailed down by now, but an algorithm is only ever going to be so accurate, it can only work on the data inputted. By allowing the user to refine the results which are displayed you are removing the need for that element of complexity in the algorithm and putting the control in the hands of the user, allowing them to build their own, bespoke results to their particular needs.