I wanted to tidy up the steering column appearance without having a mass of plastic around it. To this end, I have cut a length of roll wrapped CF tube that just fits over the column. A small bolt secures it and doubles up as a P-clip mount for the curly cable.
I was also going to make a steering wheel centre trim out of CF but the agricultural steering boss I have at the moment doesn't make it easy. For the sake of KISS I just ended up buying the plastic one from Mountney.