Flipping through a stitch dictionary earlier, I had already fallen in love with the Celtic Cable stitch pattern and really wanted to use it for something but I didn't know what. The design challenge brought those two elements together. I would use the cable stitch pattern for the cushion, and use the four balls of different coloured but same weight yarn together in a textured design.
The name Caithness comes from the Celtic Cable. Having already got an alliterative descriptive in celtic cable cushion cover, I had to have a name that began with C, and then it was just a case of looking over a map of Scotland to find a suitable place name beginning with C to bestow upon my cushion.