A Pattern for Reusable Repository Design in Laravel - http://www.slashnode.com/reusable-repository-design-in-laravel/

RepositoryInterface.php

<?php namespace Acme\Repositories;

/**
 * RepositoryInterface provides the standard functions to be expected of ANY 
 * repository.
 */
interface RepositoryInterface {
	
	public function create(array $attributes);

	public function all($columns = array('*'));

	public function find($id, $columns = array('*'));

	public function destroy($ids);

}