I am a Drupal web designer - I've been working in Drupal web development since about 2008, so I can make it do whatever I want. At Turtlereality we build complex bespoke web sites including mobile-friendly e-commerce websites, charity websites and CiviCRM websites for charities.
You can see some examples of my Drupal Web Design on the Turtlereality web site
Why Use Drupal for Web Design?
Of all the platforms that we have used and evaluated, Drupal comes out top for flexibility, security, and overall power. Picking a platform is tricky and things are always changing but the last 10 years have seen Drupal keep its place at the forefront of web tech and grow its developer base.
Drupal is also looking good for the next five to ten years with a very positive team of people behind it, some great technical innovations, and a huge community of developers both using it and creating it.