I am using a lovely cotton sari. Slightly sheer, so the wool should migrate well through the fabric. I start by placing the wool roving, a blend of burgundy and grey and a touch of white silk, over all the raw edges. And a few bands of roving to place the decorative touches over.
This piece was then wet with cold soapy water and rolled up and worked until a firm state, but NOT until the shrinking has begun. This is when you may add the texture that bobbles bring. Gather some fine yarn and some beads or pebbles or marbles.
After the scarf is rinsed and dried, you will need to cut the yarn around the bobble, and push the beads out the back. The shape will remain even after the beads are gone.