Yay fun Resize an image wherever you want with this fun and nice dandy helper in Magento.

Data.php

<?php
/**
 * @author Pieter Paßmann @ graphodata AG 2013
 * @website graphodata.de
 * @description Resize any image with your own helper.
 */
class Graphodata_Resizeimg_Helper_Data extends Mage_Core_Helper_Abstract
{
 
    /**
     * Returns the resized Image URL
     *
     * @param string $imgUrl - This is relative to the the media folder (custom/module/images/example.jpg)
     * @param int $x Width
     * @param int $y Height
     */
    public function getResizedUrl($imgUrl,$x,$y=NULL){
        $imgPath=$this->splitImageValue($imgUrl,"path");
        $imgName=$this->splitImageValue($imgUrl,"name");
		
        /**
         * Path with Directory Seperator
         */
        $imgPath=str_replace("/",DS,$imgPath);

        /**
         * Absolute full path of Image
         */
        $imgPathFull=MAGENTO_ROOT.DS.$imgPath.DS.$imgName;
 
        /**
         * If Y is not set set it to as X
         */
        $width=$x;
        $y?$height=$y:$height=$x;
		

        /**
         * Resize folder is widthXheight
         */
        $resizeFolder=$width."X".$height;
		
        /**
         * Image resized path will then be
         */
        $imageResizedPath=MAGENTO_ROOT.DS.$imgPath.DS.$resizeFolder.DS.$imgName;

        /**
         * First check in cache i.e image resized path
         * If not in cache then create image of the width=X and height = Y
         */
        if (!file_exists($imageResizedPath) && file_exists($imgPathFull)) :
            $imageObj = new Varien_Image($imgPathFull);
            $imageObj->constrainOnly(TRUE);
            $imageObj->keepAspectRatio(TRUE);
            $imageObj->resize($width,$height);
            $imageObj->save($imageResizedPath);
        endif;
 
        /**
         * Else image is in cache replace the Image Path with / for http path.
         */
        $imgUrl=str_replace(DS,"/",$imgPath);
 
        /**
         * Return full http path of the image
         */
        return '/'.$imgUrl."/".$resizeFolder."/".$imgName;
    }
 
    /**
     * Splits images Path and Name
     *
     * Path=custom/module/images/
     * Name=example.jpg
     *
     * @param string $imageValue
     * @param string $attr
     * @return string
     */
    public function splitImageValue($imageValue,$attr="name"){
        $imArray=explode("/",$imageValue);
 
        $name=$imArray[count($imArray)-1];
        $path=implode("/",array_diff($imArray,array($name)));
        if($attr=="path"){
            return $path;
        }
        else
            return $name;
 
    }
}