gistfile1.txt

public function getColour() {

	    // Try returning banners for this page
	    $colour = $this->getField('HexColor');
	    if ( $colour ) {
	        return $colour;
	    }

	    // No colour for this page? Loop through the parents.
	    $parent = $this->Parent();
	    if ( $parent->ID ) {
	        return $parent->getColour();
	    }

	    // Still need a fallback position (handled by template)
	    return null;
	}