magento:set custom theme for a particular page

We can set custom theme for a particular page in magento by adding following code in the corresponding controller:

In the example below i have applied  custom theme for subscribe action, You can apply to your action e.g. indexAction,checkoutAction..etc.

 public function subscribeAction()  

   {
          ..

          ..

 

              Mage::getDesign()->setTheme('fYour theme name');   /* Now you know the secret */               
               $this->loadLayout();                        
               $this->renderLayout();

       }