RICORUMI Nilli Nilli. Rico Nilli Nilli DK is a 100%n Polyester Chenille Ricorumi yarn in cute fluffy little 25g balls created especially for making the cute and quirky Crochet Amigurumi creatures. These work perfectly along side the Ricorumi which we have a huge range of 60 colours and a lovely selection of books which can be found at the links below.