When we checked into colors we stayed with black which matches any chair base. Due to new technology, black wheels should no longer mark floor surfaces. All caster styles except Dual Wheel Duets, Futuras, and Safety Casters come in various finishes. No there are several styles of casters available with hoods in different finishes. Any soft wheel caster will work.
All soft wheels are non-marking.
Standard neck casters are form fitting and will fit all style chair bases. This is where the oversized neck casters are used to make the chair base and casters look as one. It depends on where the caster is being used, floor surface, how much usage a chair receives, and style preference. A chair in a police station may have 24 hour usage, an office chair 8 hours, a chair at home even less. Most casters used properly are the same, except for the Twinstar style.