How to theme regions in non-standard themes like Consilium?
regions are normally defined in the [theme_name].info file in the theme directory. Here is an example from the Bartik theme:


  name = Bartik
  
  description = A flexible, recolorable theme with many regions.
  
  package = Core
  
  version = VERSION
  
  core = 7.x
  
  stylesheets[all][] = css/layout.css
  
  stylesheets[all][] = css/style.css
  
  stylesheets[all][] = css/colors.css
  
  stylesheets[print][] = css/print.css
  
  regions[header] = Header
  
  regions[help] = Help
  
  regions[page_top] = Page top
  
  regions[page_bottom] = Page bottom
  
  regions[highlighted] = Highlighted