Alex mentioned coloured filters. I would have thought the main use for these would be with B&W film. I used to use a green or yellow/green filter for general purpose, an orange filter to bring out any clouds in a blue sky and to darken the sky quite dramatically plus a red one for very dramatic skies. Most useful for colour film as has already been mentioned would be a circular polariser (nothing to do with the physical shape of the filter but the structure of the polarizing element) and a couple of ND filters of varying strengths.
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