Can you knit with 4 strands of yarn?
Easy Chunky Knit Blanket with 4 strand knitting:
You need to make 20 blocks that are joined together to finish the blanket. To make each block, cast on 20 stitches on a size 19 needle holding four different yarns together as one. … This is a great blanket to use up all of the random balls of yarn you have accumulated.