Need felt which you can get pretty cheap from diaso, soecial needles a sponge and warm water! And soap! so you just take a small handful of felt and mix with another colour of felt, put some warm water put some soap and start poking!
You can also roll it into a ball and if you find that the two cannot join together perfectly, no worries you just have to keep hitting it or poking it!!
You can also do small animals with it!!