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Yahoo Image Search Adds Search Features
The options include the ability to filter by sizes include wallpaper, large, small or even a custom size. You can select black & white and or color, you can select photo or graphic and you can restrict the search to Flickr only or not from Flickr.
Postscript: Yahoo told me this is a limited test, a Yahoo spokesperson told me:
This is part of ongoing tests to identify how we can make search even more relevant and deliver the best possible online user experience.