style-colors.php

<?php
/**
 * @package xxxxx
 * @author xxxxx
 * @link xxxxx
 */

header( 'Content-type: text/css;' );

$url    = dirname( __FILE__ );
$strpos = strpos( $url, 'wp-content' );
$base   = substr( $url, 0, $strpos );

require_once( $base .'wp-load.php' );
?>

/*Example of the CSS/PHP that follows:*/

#some_element {
    background-color: <?php some_function( 'some_element', '#000119' ) ?>;
}