5.3 Header Options
in Appearance -> Customize you have several tabs with option that allow you to customize your blog.
You can enable "Sticky header" which will "Stick" to the top of page and follow user while scrolling. Example http://holomatic.purethe.me/sticky-header/
You can also add image to the header, or even several images and "randomize" it (each refresh will show random image from uploaded)
You can also add the social icons in the header.