Similar to Google’s Wonder Wheel, there is an image search that links concepts. Click on Image Swirl, and start clicking on linked concepts.
Google has done it again. I really like all the neat things they come up with. This one is great for expanding your vocabulary and finding related concepts. It is called Wonder Wheel. On the regular search page, near the top, click on Options, and then choose Wheel in the left-hand menu. It works like the Visual Thesaurus, but is free.