Here is a description with picturess and text on how to knit a Icelandic Sweater.
Beautiful Bohus Knitting: Stranded Color Knitting Patterns To Try
The challenge in Bohus knitting is that this intricate colorwork is knitted in a small gauge, requiring knitters to balance small needles while also dropping and picking up different colored strands of yarn — sometimes four or five colors in the same row.
Krummi - Raven pattern by G. Dagbjört Guðmundsdóttir
Ravelry: Krummi - Raven pattern by G.
Icelandic Lopi Sweater Custom made item by unneva on Etsy