This is not intended to be an instruction for C2C. It is just to show how I designed a holiday-specific graphic using a C2C stitch.

I used Lion Brand Basic Stitch in Ivy (Main Color) and White (Contrast Color), but depending on the thickness of the scarf you want, you could use any 3 light or 4 medium yarn.

If you want to make the scarf shorter, you would have to cut out an even number of Main Color rows in the Middle section (or if longer, add an even number of Main Color rows).

If you would want to make it wider, I would probably suggest adding one block on each side - otherwise the shamrock design would not remain centered.