Kingsy

    public function diamondAction() {
        /**
         * Lets assume only one extra param is being passed for now
         */
        $params = $this->getRequest()->getParams();
        Mage::register('cmstemplate_navigation/grid', array("diamond",key($params)));
        $this->loadLayout()->renderLayout();
        Mage::unregister('cmstemplate_navigation/grid');
    }

Kingsy

<?php
        function createImage($str) {
            header("Content-type: image/png");
            $handle = ImageCreate(180, 50);
            ImageColorAllocate($handle, 255, 0, 0);
            $txt_color = ImageColorAllocate($handle, 255,255, 255);
            ImageString($handle, 5, 15, 18, $str, $txt_color);
            imageflip($handle, IMG_FLIP_HORIZONTAL);
            ImagePng($handle);
        }