After browsing materia.nl (thanks Annet!), I was able to find some materials that really interest me. Here is a list of renewable materials that I found that have all been molded to create usable products:
Organoid moldings: http://materia.nl/material/organoid-moldings/
Made from organic fibres and a natural binder, are capable of achieving complex curves through a relatively simple production process. Applications include home accessories, door handles, building insulation and car parts.
Mycelium products: http://materia.nl/material/mushroom-materials/
For design and packaging purposes. When combined with different forms of agricultural waste, the mycelium acts as a binder, and results in materials that resemble foam and plastics.
BioBlocks are made of pressed peat from the National Park Weerribben and Wieden. The blocks are air dried for a period of four to eight weeks. These blocks can be used for a variety of wall constructions or for filling gabions. BioBlocks also regulate moisture very well, absorbing and retaining excess moisture that they later release, thus regulating the natural climate of interior spaces.
PaperFoam is a packaging material made from industrial starch, using an injection moulding process. It is based on natural materials. The main ingredient is industrial starch, which is retrieved from potatoes or tapioca.
Woodcast is a completely non-toxic and perfectly mouldable/re-mouldable material suitable for casting work. It is manufactured from clean wood and biodegradable plastic and can be moulded without water or rubber gloves.