As with all of these "Getting Wild" lessons, I'm going to assume you're comfortable with basic dyeing techniques. If not, take some time to review those lessons.
When doing any of the "Getting Wild" lessons, it's important to have an open mind about what you're doing. If you're the type of person who has to know exactly what you're getting, this may not be for you. But if you enjoy closing your eyes, choosing a jelly bean, and popping it into your mouth to see what flavor it is, you'll have a blast with this. :)
For this lesson, you can start either with plain muslin you've prepared for dyeing, a white-on-white that you've prepared, or a light color from a previous dyeing session. Each will turn out different, so plan to experiment a bit.
Prepare a batch of dye in any color and any strength. In fact, you might want to prepare two cups of dye so you have enough to cover the fabric if you're trying all of these techniques in one session. (Remember your safety tips!). Also get out a small bucket (I like the 2.5 quart size). Depending on the technique, you'll also need some rubber bands, some kind of clamp (the "binder clamps" at the office supply store work great), and a needle and thread.
First, take a piece of damp muslin and twist it into a rope. Keep twisting until it won't twist any more, and secure the ends together with a rubber band. (Fold the "rope" in half and use one rubber band for the two ends to keep it from untwisting.) Drop into your bucket and cover with dye. Let sit as usual, then rinse and wash as usual.
For our next trick, take a piece of muslin and fan fold it in one direction. Then fan fold in in the other, until you have a small square or rectangle. (Fan folding is important. Don't fold in half and half again, etc. It won't come out the same.) Secure with a binder clamp. This will make a really cool secondary pattern if you put the binder clamp on the diagonal. Drop into your dye bucket and proceed as usual.
Finally, take your needle and thread, knot one end, and run basting stitches through the fabric. Your stitches can be in straight lines, curves, circles, other shapes -- what ever strikes your fancy. Pull the thread tight to gather up the fabric, and tie another knot. Drop the fabric into your dye bucket and proceed as usual.
All of the above use the fact that the dye will only dye the fabric it can touch. So by folding the fabric in various ways, we are keeping the dye from part of the fabric, which makes a pattern. You have control over the pattern by where you put in the folds and how tightly it's folded. If you think of another method, go ahead and try it! Remember, if you don't like the result, you can always overdye it, or be very popular at your guild by giving it away. :)