Как узнать название дизайна, темы в Magento. Подборка простых методов.
Mage::getSingleton('core/design_package')->getPackageName();
Mage::getDesign()->getPackageName();
Mage::getSingleton('core/design_package')->getTheme('frontend')
Mage::getDesign()->getTheme('frontend');
Mage::getStoreConfig('design/package/name');
Mage::getStoreConfig('design/theme/skin');
Mage::getSingleton('core/design_package')->getTheme('frontend');
Mage::getSingleton('core/design_package')->getTheme('template');
Mage::getSkinUrl('your_image_folder_under_skin/image_name.png');
Mage::getSingleton('core/design_package')->getSkinBaseDir();