You are looping through some arrays and you have some image variable, path of original image. You want to print out some variation of that image, this is what you do
print theme('imagecache', 'User_profile', $viewPred->users_picture, $alt, $title, $attributes);
User_profile is imagecache variation and after that is variable where path of our original image is stored. I got that variable from a drupal view but you could get it in some block, or page file or wherever.