You can select the standard header image from the T4 Media Library, or create one of your own. If you're creating your own, the width dimensions should be 600 pixels. The standard header is in the ...

For example, using GIMP you can put together a standard banner-header image, including pictures and text. Open GIMP, then select "File," then "New." The New Image dialog appears.

By editing your blog's HTML code, you can allow for the addition of a gadget above the header. Log in to your Blogger account. Once logged in, you will be transported to your Dashboard.