First I soaked my fabric (this was some of the leftover muslin that my friend Joani gave me a month or so ago) in a soda ash solution, spun the excess liquid out in my studio washer, then scrunched it all up and put it in a plastic bag, and hung it outside of my studio for about 48 hours. The temp never got above freezing during that time period! Then I poured some leftover blue dyes over the frozen ball, followed by some Pro Chem Khaki Procion MX dye.
The colors aren't very vivid, but what I really like are how they blended together, so in some areas you see the colors together but yet separately....does that make any sense? It is quite nice!
If you've tried freeze-dyeing and have a good technique, I'd love to hear about it. I know that some folks use their freezers for this, so that is always a good option.