Hello, This is something I wrote a while back, but perhaps it will help you.
The header layout choices and color schemes work together in a way that actually provides you with many more options than you would think. To see how it works together, first choose the photo you want as your logo.
Size it in your photo manager program to about the size you want. My logo photo is 309x240 pixels. Upload it into the image gallery. In site designer, select your logo photo, “next to title” and “large/true size”. If the size is too big or too small, delete it, go back to your photo program and adjust. Of course, you are working with a copy of the photo and never the original.
In header, type some text. You can change it later, but for now put some in so that you can watch what happens to it as we go along.
Under theme, choose “general, no photo”.
Skip to navigation and choose one of the three arrangements. It is possible to remove the navigation bars. The grey line under my title and logo photo is really the navigation bar. Left navigation leaves a wide blank space on the left side of the page, but it does seem to leave more room for tabs. On the other hand, one site I know has so many tabs on the left side that it is overwhelming.
Go to color and select the first set. Go back to style and select the first option. Take a look. Next go down the list of style options watching how your text and photo are affected. Don’t bother looking at the symbol for the style options – it does not give you a good idea of what the finished header will look like. (I’m using the last one on the list. I guess this is why it took me half the night to do.) You will notice that different colors from the color scheme are featured with different styles. So, it is worth while to take the time to look at ALL the combinations. For me a factor was what color the navigation bar would be since it would be underlining my header. So when the nav bar turned up orange and purple again and again I didn’t choose those combinations. When the nav bar turned up grey (with the color set “shadow”), I couldn’t see my text, so I changed the text color to bright green. Suddenly, I hit on a combination that I really liked. Go to the next color set and go down the list of styles again. I’m not going to do the math, but there are MANY choices when you do it this way.