title: How to render block programmatically with standard theme
body: <p>I know how to get block data by module_invoke(),</p>
  
  <p>but how to use standard block theme for rendering it.</p>
  
  <p>I tried to use theme() function but with no success.</p>
  
  <p>Could somebody give me advice?</p>
  
  <p>Regards</p>