I can at least describe what I did. I've been working with braided dyed rovings from HipKnits lately and wondered if I could make something similar. So I took a length of Romney roving and braided it to itself (the remembered skills of my seven-year-old self do come in handy sometimes!). I then soaked it in water while I prepared the dye baths.
I decided to dye the roving three colours, in sections. I mentally divided the roving braid in half and folded it over so that the centre of each half would stick down into a jar. I then prepared Berry Blue and Orange Kool-aid in two different canning jars. I put the folded fibre into the jar, leaving the ends and centre of the whole braid out. I let these cook on medium for a few hours, and then pulled them out and rinsed them.
Then I prepped a third jar with red (well, it was leftover red, I don't know which mix it was) and put the still-white centre of the braid into the red. I left that for a few hours as well.
This morning everything had cooled. I rinsed the braid, unbraided it and left it to dry. It looked really cool, and I took a picture to show you, but unfortunately I can't get it off the camera at the moment. I need to find my other card reader...
Edited - OK, I've gotten the photo sorted out now:
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