protected function _createProduct()
{
 $product->setCreatedByCustomerId($customerId);
$emaildate = Mage::getModel('core/date')->date('Y-m-d H:i:s');

$data = array('product_id'=>$product->getId(),
        'customer_id'=> $customerId , 'created_at' => $emaildate);
$model = Mage::getModel('example/mydesign')->setData($data);