Oh boy, did I have fun with this one! Operation Write Home is one of my favorite causes, and they had this fun Spirelli tutorial up a few days ago. I combined this technique with a couple other challenges: Less is More: Colour Challenge and CAS(E) This Sketch: #18.
Are those cute, or what? Because my ridges weren't deep, I used thread. Yee! You are going to see more of this, I guarantee it.
Until next time,