Google added a new sorting option for Google Images that lets you sort the images by subject.

So if you are looking for pictures on a topic but want to know subjects for those pictures, you can use Google Images. For example, if you want to create a presentation on SEO and want to know what subjects the presentation might have, you can try to search Google Images by subject sorting for [seo] and Google will recommend subject. They aren’t perfect but hey!

Google said:

Here is a video:

Keep in mind, it doesn’t always work and forces you to sort by relevance when subjects cannot be determined. Here is an example:

For more sorting options, see google.com/landing/imagesorting/.

Forum discussion at WebmasterWorld.