Instructions:

1. Take a wad of carded wool fibres and roll into a ball.
2. Dip the ball into a dish of warm water mixed with a small amount of washing up liquid.
3. Roll the ball of wool in your hands until the ball hardens. Keep dipping it in the water and changing rolling patterns to ensure the fibres felt together. Rinse the balls out and leave to dry.
4. Repeat with different colours of carded wool.
5. Poke a hole through the balls and thread onto a piece of string.

All items (or similar) are available from Play Resource Shop & Scrapstore.