Emily Green – 'Emmeline' necklace. Hand formed polymer clay beads on tan braided leather cord. Designed and made in Melbourne by Emily Green. • See more at The Big Design Market on 6/7/8 December 2013 – Royal Exhibition Building, Melbourne. www.thebigdesignmarket.com
Okay, this is ridiculously simple and sort of "why didn't I think of that". Such a beautiful effect and very easy. Tutorial is in Russian but the pictures explain it all. By a blog called Все о полимерной глине which translates to "All of Polymer Clay".
Salt Technique. Polymer Clay - To make a beautiful and unusual beads requires only salt, plastic desired shade, and a little imagination. Beads rolled in salt, grains of which are pressed into the product. After baking, the salt is washed with water, and in its place remains uneven depressions. Then what effect we want to achieve, depending on the size of the salt crystals.