Is it possible to use a different theme for just a section on the page? In Drupal 7, using a different theme on each page is easy, but what I could really use in this particular case is 2 themes on the same page. 

Let's say I want to use Rubik theme for all page sections (menu, etc.) except 'content' section, where I'd like to use Stark theme.

Is this possible at all? If it is, how?
Thanks Clive and Cromian for your input. Guess its not possible to actually use 2 different themes on the same page.

The simplest solution I found is to use one theme, then add 2nd ones css using drupal_add_css function. Then hope 2 CSS don't interfere too much and it's good enough without HTML part of the theme.