A while ago I bought a weird fluffy, knitted, tubular scarf from Poundland to try felting with. If you ever buy one, make sure you cut it over a bucket or newspaper or something to catch all the bits! I laid out a couple of layers of very wispy pink Merino tops left over from a book cover I made last year, then I added the piece of scarf, and 2 more wispy layers of wool tops. It didn’t take long to felt. This is one side of it:
