
As of yesterday, the ‘related search links’ at the top of the search results page (SERPS) throw up examples onmouseover. In other words it show you options on your search with example images.
Google Product Manager, Peter Linsley, explains with his own example:
When planning a trip to Greece, I may not know what places are worth a visit, so I search for [greece] on Image Search. Now, with more visual search links, I can hover over the links on the top of the results, like [santorini greece], and see a panel pop up with images of Santorini.

The process is quite intuitive because it makes easy to drill down by just clicking on images until the choice is no longer broad enough to throw up related searches.
The official Google blog says the new visual related links are being rolled out globally over the next few weeks, but I found them operational already on broad travel related searches.
Feature image: gerlos