How to get the theme for each component, works on the active store:

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Mage::getSingleton('core/design_package')->getTheme('locale');
Mage::getSingleton('core/design_package')->getTheme('template');
Mage::getSingleton('core/design_package')->getTheme('skin');
Mage::getSingleton('core/design_package')->getTheme('layout');
Mage::getSingleton('core/design_package')->getTheme('default');