I did not take pictures of the process but it is pretty straightforward, with one big difference. I used dye powder (Use a Mask!) sprinkled on the ice. It uses quite a bit of dye powder and could be considered wasteful and/or expensive if you wanted to sell your fabric. I justified it by using my dyes that were getting old. I am going to experiment with layering fabric to see if more of the dye can be used before it is exhausted.
I love the results, much brighter than liquid dye concentrate on snow. I also used a heavier cotton (Pimatex) than the usual muslin.
The best part is the colors are a close match the quilt I am making so I will use it to cover the headboard.
The quilt top is on the left (stripes) The ice dye on the right is 3.5 yards of 58" Pimatex.