Wet felting is a process in which one takes a piece of wool roving (unspun wool) and uses water and agitation to turn it into a solid piece of fabric. The resulting piece of felt can be used to embellish other fabric items or can be used on it's own as a scarf or a coaster. Wet felting projects are by nature very textured, but there are ways that you can manipulate the felt to create different textures for your projects.
Lay the roving on a textured surface such as bubble wrap or bamboo sushi rollers. Saturate the wool with hot, soapy water. Once the wool is wet, felt it by rolling it in the wrap vigorously. The surface you roll your wool in will affect the surface texture of your finished felt.
Agitate your wet felt by rubbing it on a bumpy surface such as a bamboo sushi roller or a old-fashioned wash board. The more you agitate your felt, the more it will shrink, making the texture thicker and more stiff.
Vary the types of fibre you use. Generally speaking, only natural animal fibre can be used for felting, but the fibre you choose will affect the texture of your final product.
Create textural bumps by tying small stones into your fabric with elastic before felting. You can also pinch the fabric with paper clips or elastics which will result in a wavelike pattern in your final product.
Combine your felted fabric with other pieces of felt or other fabrics to create a uniquely textured piece. Felted fabric can be cut and sewn together to form three-dimensional textured pieces.