It looks like Google has debuted a new look for app suggestions in Google search results on mobile. Now, when searching for a specific category of app, you'll be presented with a colorful list of popular suggestions from Google Play at the top of your results. The exact keyword mechanism for triggering the new look appears to be a little picky, however. For example, simply searching "hotels" brings up the older style of app suggestions. However, typing "hotel apps" will show the new, more colorful results.
Google originally started surfacing app suggestions in its mobile search results in April, but with a much more bland UI. The new look seems to be much more eye-catching, and is makes browsing a bit more convenient with the option to expand the suggestion box for vertical scrolling.