Ditto on black gaffers tape. I use it for several unorthodox things. I have thin ~3/8" strips of black gaffers tape around all my L lenses to protect/hide the red ring area from thieves and scuffs. I use it over some of the lens slide switches when they rub my leg as I carry them hanging to the side and they get switched without my knowledge. I use it to protect other parts of the camera. I use it to hide the Mark III logo on my 5D3. I use it to hide the Tamron logo on all my lens caps. I use it to provide rubbery grip areas on my S95.
