Shibori felting is really interesting and even more unpredictable than regular felting because you never quite know if your resists are going to do what you expect them to or how the rest of the fabric is going to react.
Still, it's a lot of fun to play with this technique, and an easy way to give your felted knitting more texture and drama.
To start, you need a piece of knitting to felt, some non-felting yarn, string or rubber bands to hold your resists in place, and items to serve as resists.
For the sample used in this tutorial, which is a scarf, I used two different sizes of glass stones (like you'd find in the floral department of a craft store) and clothespins.
I folded the end of the scarf to the back of the work and made another little tuck in the fabric before I clothespinned it down using 6 clothespins on each end.
Then I used 5 small glass stones in a sort of pyramid pattern and 3 larger stones more or less in a straight line. Because felting is pretty organic I didn't pay a lot of attention to spacing or making the two sides of the scarf match perfectly.
The main thing you need to know when felting a shibori project is that your resists need to be attached firmly to the knitting. Several of mine fell out on this project, which is fine, but it made the results more unpredictable.