Libre 2 is a lovely theme available in the WordPress.com theme repository that is also available to download from there and use on self-hosted sites.
I don’t know why Automattic (who make the theme) don’t add it to the WordPress.org theme repository as well?
I wanted a header for my self-hosted site, No More Pencils.
I had previously been using Cocoa, a theme from ElmaStudio. (I actually bought all their themes as a bundle when they were doing a promotion. I like their themes but I wanted a change.)
Cocoa is available as a premium theme on WordPress.com, which comes included with the package if you have one of the paid plans.
For the header on No More Pencils, I made a chopped-down version of the photo you can see above.
You might spot that there is more background to the left of the sheep – which I made by copying a section of the background and extending the image.
I did it because of the dimensions of the header image that the theme required.
Why a sheep? Or as Groucho Marx might have said ‘Viaduct?’
No reason except my heart warms to animals that look as though they are contemplating the universe and are the chased rather than the chasers.