The default k2 user module is bland and takes up a lot of space. How can I make it look like the one on getk2.org?

Hi. You can change completely the look of a module by creating a module override as you would do with any standard Joomla! module. More information can be found at docs.joomla.org/How_to_override_the_output_from_the_Joomla!_core .