Example of how to filter EE's locate template function to add the path of any custom templates you may have within a custom functions plugin (in a `/templates/` directory). Place your custom template in /plugins/{your_custom_plugin}/templates/

tw_ee_cfp_template_paths.php

<?php //Please do not include the opening PHP tag if you already have one

add_filter('FHEE__EEH_Template__locate_template__full_template_paths', 'tw_ee_cfp_template_paths', 10, 2);
function tw_ee_cfp_template_paths($template_paths, $file_name){
	$custom_template_files = array_map('basename', glob( plugin_dir_path( __FILE__ ) . 'templates/*.php'));

	if(in_array($file_name, $custom_template_files)) {
		array_unshift($template_paths, plugin_dir_path( __FILE__ ) . 'templates/' . $file_name);
	}
	return $template_paths;
}