There seems to be no end to all those creative challenges of this world. Here is yet another one: Create Berlin is calling for entries to the BerliNordik design competition. Its concept is all about sustainable design and while the last edition of this contest was about fashion, this one is about product design. Product and interior designers still have time until April 23, 2010 to submit their designs. The best entries will be part of the exhibition Bright Green Design that will take place from June 8-13 during DMY. For more infos about the challenge read on here.