I've just released my own theme for Ghost. It's called Ripa and you can download it from GitHub.
This site now uses Ripa. Since the support for some features like tags, search and plugins is virtually non-existant on Ghost in the current version (0.3.3), the theme is quite basic. But feel free to use it and modify it in any way you like.
I've now changed the theme here, so here are some screenshots of the theme:
Index page footer
Post page footer