This is a script I used in Home Assistant to distribute color palettes on participating lights.

script.yaml

alias: Light / Hue Scene
description: >-
  This script tries to replicate the Hue scenes. Colors are distributed randomly
  on participating lights. Each scene currently has five different colors
  represented by XY values. The script is only applied to lights that support XY
  color mode.
fields:
  target:
    name: Target
    required: true
    description: Select one or more areas or light entities.
    selector:
      target:
        entity:
          domain: light
  scene:
    name: Scene
    description: Which scene? Scenes are taken from the Hue app.
    required: true
    default: Savanna Sunset
    selector:
      select:
        options:
          - Savanna Sunset
          - Golden Pond
          - Horizon
          - Frosty Dawn
  onlyonlights:
    name: Only lights currently on?
    description: If enabled, the scene is only applied to the lights currently on.
    required: false
    default: false
    selector:
      boolean: null
  skipgroups:
    name: Skip groups
    description: If enabled, group light entities will be skipped.
    required: false
    default: true
    selector:
      boolean: null
sequence:
  - variables:
      colors: |-
        {% set scenes = {
          "Savanna Sunset": {
            "colors": [[0.644, 0.3348],[0.5246,
              0.3864],[0.4801, 0.4309],[0.5862, 0.3575],[0.4162, 0.4341]]
          },
          "Golden Pond": {
            "colors": [[0.5695, 0.3999],[0.482,
              0.4489],[0.496, 0.4424],[0.5584, 0.4083],[0.5063, 0.4474]]
          },
          "Horizon": {
            "colors": [[0.2779, 0.2188],[0.1811,
              0.1979],[0.5247, 0.3877],[0.592, 0.385],[0.1731, 0.1978]]
          },
          "Frosty Dawn": {
            "colors": [[0.4221, 0.386],[0.387,
              0.4328],[0.4013, 0.4172],[0.439, 0.3782],[0.4675, 0.3769]]
          }
        }%}
        {{scenes[scene].colors}}
      lights: |-
        {% set l=[]%}
        {% if target.area_id %}
          {% if target.area_id is iterable and not target.area_id is string %}
            {% for a in target.area_id %}
              {% set l = l + area_entities(a)|select('match', 'light.')|list %}              
            {% endfor %}
          {% else %}
            {% set l = l + area_entities(target.area_id)|select('match', 'light.')|list %}
          {% endif %}
        {% endif %}
        {% if target.entity_id %}
          {% if target.entity_id is iterable and not target.entity_id is string %}
            {% set l = l + (target.entity_id|list) %}
          {% else %}
            {% set l = l + [target.entity_id] %}
          {% endif %}
        {% endif %}

        {% if onlyonlights %}
        {% set l = l| select('is_state', 'on')%}
        {% endif %}

        {% if skipgroups %}
        {% set l|from_json %}
        [{%- for ll in l -%}
          {%- if not state_attr(ll, "entity_id")-%}
          "{{ ll }}"
          {%- if not loop.last-%},{%-endif-%}
          {%-endif-%}
        {%- endfor -%}]
        {% endset %}
        {% endif %}

        [{%- for ll in l %}
          {%- set colormodes = state_attr(ll, "supported_color_modes") -%}
          {%- if "xy" in colormodes -%}
          "{{ ll }}"
          {%- if not loop.last-%},{%-endif-%}
          {%- endif -%}
        {%- endfor -%}]
  - repeat:
      for_each: "{{ lights }}"
      sequence:
        - service: light.turn_on
          data:
            xy_color: "{{ colors|random}}"
          target:
            entity_id: "{{ repeat.item }}"
mode: single

An updated version of this can be found here: https://github.com/nilsreiter/home-assistant-scenes/