Custom Design for admin side OPENCART

I would like to have a custom theme for admin side in Opencart, This theme has to be easy to install and of course easy to used, friendly desing. Here some examples of what I expect: [login to view URL] [login to view URL] WT.ac=category_thumb&WT.seg_1=category_thumb&WT.z_author=displayinline [login to view URL] [login to view URL] [login to view URL] [login to view URL] All code needed has to be done this is not only a design project.