This triple spiral pattern makes a great trivet or potholder when worked in cotton and a lovely decoration with any fiber.
The inner color uses approximately 30 yards of worsted weight yarn, and the outer uses approximately 35 yards of worsted weight yarn.
For more information about the triskele, you can visit its Wikipedia page.

Photos in green and cream ombre show how the spiral looks after each step. Hopefully this helps you visualize how things should go.

Some people have added a border using slip stiches or single crochet, and it looks great.