You will NOT find a solution that you are looking for. Headway is the closest you will get. If you are looking to design sites, then we would recommend investing some time in learning the platform. That will vastly improve the overall quality of your work. I learnt by trial and error (exactly the same thing you are doing). Modifying existing themes to make it work for me. After a little bit of time, I was able to create my own themes. I would highly recommend you to not give up. The founder of genesis and StudioPress learnt the same way.