How to make a glowing orb.

I wanted to know how i would make a glowing orb like the one shown in this picture.

http://www2.indigorenderer.com/joomla/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=6548&g2_serialNumber=2&g2_GALLERYSID=f9742407536bf5abe5e80058c8e4eadd

Either use Indigo (as the image you linked to did) to render a mesh with an Emit material or setup Radiosity in Blender Internal. For more on Radiosity see: http://wiki.blender.org/index.php/Manual/Radiosity