Using DISGN PATERN inside an MVC Framework

I have been using CodeIgniter and Laravel Framework for almost 2 years with out any knowledge in Design Paterns. Honestly I have learned about Design Patern just now.

I know that the said Frameworks uses MVC Design patern.

Now my question is how can I apply any Design Patern inside an MVC like CodeIgniter and Laravel.

Thanks in advance.

--Vienmar