I've put a snowfall javascript on oprod.net and also on my Tumblr account. The script I've got from: http://www.peters1.dk/webtools/javascript/sne.php?sprog=en.

You can also get the script on your website or Tumblr page just by pasting this code before </body> tag at the end of the page.

Also I have installed a Disqus plugin for Joomla, so feel free to comment.