New design on already existing website

My classified ads webpage already exists, but needs a much better design. A sleak, minimalistic, classy and easy design. Things should be clear and also in harmonious and comfortable colors. Like for example Apple design(do not copy their design). The website already exists and uses a certain template, and I want a new template with different design on top of the existing code. This means its good if you understand code but must absolutely be able to supply a good design. Here is the current design: [login to view URL] I am interested in you showing me, the design you would replace it with. As part of the project, the current design works fine in mobile form, and this design should not create any changes. In other words, it must be compatible with a mobile webbrowser.