Mix some textile soap with light hot water. Tear off a 2 inch piece of roving. Form the roving into a ball with your hands and dampen it with a small amount of soapy water.
Start to roll the roving around in your hands very gently. Add small amounts of soapy water to your hands as the ball starts to dry out, but do not drench the roving. Continue making balls of the same size until you have used up all of your roving.
Cut a 3 yard piece of embroidery floss and tie a double knot at the end. Start to thread the felt balls onto it and push them together towards the end.
Once you have threaded at least five inches of the felt balls, you can start to spiral them together. Once you have threaded all of the balls, you can sew back through your trivet to secure the spiral shape. Continue threading across the trivet until you reach the other side.
Try to end with your thread on a felt ball the same color as your thread. Sew back through the ball and pull the thread until you have a small loop. Bring your thread through the loop to create a knot. Your trivet is ready for a hot bowl of soup.