5
Yes, the theme controls color, letter type and size, block design etc. It can also change the column layout, going from a standard 3 column display (such as xoops.org) to a 1 column fixed width layout. If you browse through the theme library you will find many and varied themes. You can also install a whole bunch in one go, then turn the theme browser block on. That way you can check each theme from your own XOOPS install, going back and forth to each theme.