Using time interval and input boolean

Change Hue light on interval to random color based on state of an input boolean

Note, Philips Hue is currently the only light platform that support the random effect.

input_boolean:
  loop_livingcolors:
    name: Loop LivingColors
    initial: off
    icon: mdi:spotlight

automation:
# Changes Hue light every two minutes to random color if input boolean is set to on
- alias: 'Set LivingColors to random color'
  trigger:
    platform: time
    minutes: '/2'
    seconds: 0
  condition:
    condition: state
    entity_id: input_boolean.loop_livingcolors
    state: 'on'
  action:
    service: light.turn_on
    entity_id: light.woonkamer_livingcolors
    data:
      effect: random
      transition: 5
      brightness: 255