Search, as the foundational product Google is known for, is obviously something the company is very thoughtful of when it comes to design. Even small changes can cause a big impact on user experience and engagements, so Google is careful about how design tweaks are implemented.

One common method of testing and easing into (or out of) design tweaks is A/B testing (something we recently saw Google experimenting with in the Google+ app). Today, it looks like Google has begun an experiment on its search engine results page when users search from Chrome on mobile devices. Rather than show results in a lineup, separated by gray lines, Google is playing with a layout that puts each result on its own card, underscored by a line colored to match one of Google's four primary brand colors - blue, green, yellow, and red.