On April 21, 2015 Google when displaying search results take into account the site's ability to adapt to the size of the mobile screen. More information can be found in the article Finding more mobile-friendly search results. Whether paid or free design you want to use, I recommend to choose the responsive design. Website with design automatically adjusts to the computer screen, laptop, tablet (iPad, Android) or smartphone (iPhone, Android).
Pay design options contain more visual effects than free. They are provided by TemplateMonster (USA), with which I work since 2010. On TemplateMonster website posted a list of certified web developers, there's a web-studio Avalanche (to see the list will have to waste a page down a bit): Web-studio catalog TemplateMonster