Hippo Mat by Droog Design. The Hippo Doormat is exactly what your hallway needs if you've been wallowing in mud! Although you are not likely to have too many hippos wandering around your home, this mat is tough enough to take hard wear from some big beasts! The design, by Ed Annink, is based on a 1920s pictogram Gerd Arntz, the modernist artist, and designer.The Hippo Doormat is made of coir (coconut husk), which is very hard-wearing and should last for years, even under daily use. Hippo Mat by Droog Design are designed by Ed Annink.