As Barry Schwartz at Search Engine Land pointed out in a blog post today, Google have taken one out of Microsoft Bing's book and added the option of Find More Sizes when searching for images in Google Images.
While their Barry showed a boring example of a cow as his image search, I felt the need to republish his news with a more appetising example. So I searched for tonight's pudding:
And when you click on the More Sizes option, Google returns variants of the image in different sizes, from different resources. As depicted below:
Thanks for the heads up, cartoon Barry.