http://wiki.maemo.org/QtComponents

Read installation part carefully .
QtComponents (Harmattan one), hardcode fonts internally on plugin and on UIConstants.js file.So, to get the best look and feel you need to install 'Nokia Pure Text' and 'Nokia Pure text light' fonts on the device.(which are nokia's property and are not provided openly to every one but only to developers )
The same happens for theme. There's already a qt-components-blanco-theme package on the catalog provided before, but it only contains scaffold for the blanco theme. To get blanco theme running on the device ,you know what you have to do .
It is not an end-user approach .