You can play with these. If you want something a little more specific just let me know. It takes all of about 20 seconds to make.
Remember to set luminance to at least 1. Play with color. And remember to adjust object scale in the XYZ
For more in depth information see this thread: http://www.planetside.co.uk/forums/index.php/topic,4548.0.html?PHPSESSID=1df73cc48465567b94291bb825932a25
There are some other threads too.
Cheers.