$.fn.qtip.styles.formBuilderToolTip = { // Last part is the name of the style
   width: 200,
   background: '#B6CDFF',
   color: 'black',
   textAlign: 'center',
   border: {
      width: 7,
      radius: 2,
      color: '#003399'
   },
   tip: 'leftTop',
   name: 'dark' // Inherit the rest of the attributes from the preset dark style
}

$('label[title]').qtip({
   style: 'formBuilderToolTip' // The name of the newly created custom style above
});