Small pieces of recycled fabric are either hooked into or poked through a hessian backing, or else the strips are braided or plaited together to make a mat.
[1] In the UK, these thrift rugs were popular in the nineteenth century and during World War II in working class homes seeking to reuse precious material.
In the UK it was common to poke or pull a small clipping of cloth through a hessian backing, giving a shaggy appearance.
In the US, a thin strip of fabric was hooked through the hessian so that the top surface was a small loop pile.
A third technique is to plait, braid, lace or sew the fabric strips together.