This is as good of a tutorial/resource as I’ve found.
http://graphicssoft.about.com/library/weekly/aa080499p2.htm Has how to and software resources.
I made a new tiled background for my Blender page, using Blender and PhotoShop Elements, with the methods from the graphicsoft page, worked really well.
http://www.alaskalights.com/blender/index.htm
Mist is so much fun!