I just updated the Challah Infinity Scarf pattern to include a three-color version. The instructions are the same, but the strands are each done in a different shade and the mid-section join is striped with alternating colors every two rows.
This one was done in three shades of Malabrigo Merino Worsted held together with one shade of Shibui Silk Cloud.
If you already purchased the pattern on Ravelry, an update was sent out with a link to the new PDF. If you purchased elsewhere, I will be posting an addendum within the next few days for instructions on how to adapt the pattern to the tri-color version.