Set Light to a Random Colour

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Home Assistant Template
service: light.turn_on
entity_id: light.office_desk
data_template:
  rgb_color: >-
    {% set current = state_attr('light.office_desk', 'rgb_color') %}
    {% set colour_list = [ "255,255,255", "253,45,65", "25,98,67" ] %}
    {% set colour_list = colour_list | reject('eq', current) | list %} {{ colour_list | random }}

Quick example to set a light to a randomly selected colour from a list

Source: EveryThingSmartHome Discord Post