You may need a strong stomach to use these designs from animal leftovers, but you can't deny they have guts. From cow intestines to pig bladders, here are eight design projects exploring odd organic matter.

Cow intestines lighting, Kathrine Barbro Bendixen
Danish designer Kathrine Barbro Bendixen has created translucent tubular lighting from cow intestines and LEDs.
She decided to experiment with cow intestines after being inspired while making sausages for her family one Christmas. The intestines are sourced from a supplier in Denmark. After disinfecting and prepping them, the digestive tracts are blown up like balloons.
Barbro Bendixen works with their naturally curled forms and lights them from within to highlight their natural texture.
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Pirarucu fish skin leather by Oskar Metsavaht
Brazilian designer Oskar Metsavaht has turned the skin of the pirarucu fish ? a staple part of people's diet in northern Brazil ? into leather.
The fish skins are usually discarded after eating, while cattle ranching can result in rainforest being destroyed to make way for grazing land. As well as providing a sustainable alternative, Metsavaht hired local artisans to make the fish skin leather to give back to communities in Brazil.
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H5N8 stool, Emilie van Spronsen
Designer Emilie can Spronsen came up with a way to make use of the contaminated remains of chickens after an outbreak of avian flu hit the Netherlan...