In order to achieve a more sustainable world, both the natural and industrial circle must be closed as much as possible. Therefore, the recycling, reuse and optimal use of raw materials are essential measures. Residues from agricultural and forestry industries, as well as residues from other industries, are a source of inspiration for future materials. Below are some specific examples coming from plant, animal and artificial origins. From coffee grounds to bones, nutshells to goat stomach leather, old woollen clothes to bioplastics.