Contented is one of the better contributed themes for Drupal. This is a re-implementation of the Contented7 theme by Tom Rowan. This is a tableless, multi-column, fluid width layout. Parts of the design are ported from the K2 theme.
Nice things are that it does proper layout and it looks halfway decent. It properly handles switching between 2 and three column layout. The color scheme is an orange remniscient of leaves turning into fall colors.
Customizing contented7 is done by copying custom.example.css naming it custom.css and modifying to your choice.