Dear ____________,
What an incredible surprise it was to open the door and find a special birthday package waiting for me! When I opened the box and lifted out the lovely hand-knitted scarf, I was simply thrilled. I have always admired the beautiful pieces you knit, and now I have one of my very own. I’ve already worn it to work and have received many compliments. Thank you for being such a thoughtful friend.
Many kisses,
(YOUR NAME HERE)