I have actually tried this: Easy way to make wet felt balls
you can do it while cooking or doing some other work. Just grab the glass container, twist it, swirl it and leave it for some minutes. If it gets cold you just add some drops of boiling water and start again.
I was amazed how beautiful the balls are and how quickly they are made! You must try it too.
My camera was without power so please take a look of the photos in the link :)