Bludit is a databaseless, flat file blogging system, and you can use it as a traditional CMS as well. As Bludit is programmed in PHP, the installation is easy, you only need a standard web host.
It's easy to create individual themes, provided you know HTML, CSS and a little PHP. Also, there are a lot of free themes available.
But it is not a super-flexible CMS, of which there are admittedly only a few on the market. A menu editor is missing, and you can only have one editable area, apart from the sidebar.
Anyway, Bludit is one of my top favourites.