• For each hat, cut a 3/4" ring from the cardboard toilet paper roll.
• Cut the yarn into 12" pieces. You will need about 40 pieces for each hat.  I found the quickest way to do this was to wrap my yarn around a 12" ruler 20 times. Then cut through the loops on each end of the ruler.
• To assemble the hats you will be attaching all the pieces of yarn to the cardboard ring with a simple knot. To make the knot, fold the strand of yarn in half. Put the folded end through the cardboard ring. Then bring the two ends over top the of cardboard ring, through the looped end, and pull tight.
• Tie each piece of yarn onto the cardboard roll in this same way until you have covered all of the cardboard ring. Have the strands close together but don't overlap them.

Two style options for finishing the hats:

• Style 1:  Take all the yarn ends and push them through the cardboard tube. Take another small length of yarn and tie all the ends together, about 1" above the top of the cardboard ring. At this point I also like to take a small piece of tissue and stick it inside to help form the hat and make it sturdier. Trim the yarn ends on the top of the hat to about a 1/2" length to form a pom pom on top of the hat.
  
• Style 2: Tie all the yarn ends together BEFORE you push them through the cardboard ring. Tie them together about 1-1/2" above the cardboard ring. Trim the yarn ends to about 1" above where you tied them.

  Then push them through the cardboard ring. The yarn ends will help fill in the body of the hat and make it sturdier (so no need for a piece of tissue as in Style #1). Glue a 1" fluffy pom pom to the top of the hat.
  
• To hang your ornament, you can pass an ornament hanger through a few of the strands of the yarn. You could also add a hanger to your mini hat by making one from a small piece of yarn, string, or ribbon.