Searching in colour
Google is adding colour filters to its image search. To use it look for the 'all colors' bar underneath the search box in image search and click on your colour.
The colour palette available is pretty limited, so it's questionable just how useful this is when you could add colour into your search term in the first place. For some, however, it could be a good way to filter your results quickly when trying to find the best colour of an object.
Either way it's a small step towards visual search, such a challenge in search where the search engine will analyse an object for its meaning beyond the metadata available (e.g. photo of red car only tagged as 'car').