How to create new colors? (1.16+ example)

Example of solid color.

Colors: #Don't copy this line
  #You can create colors here. Make sure color identifiers are UNIQUE.
  #If none is selected as default. First one will be selected.
  #Remember to copy the same folder in all servers in order to keep the same color.
  red:
    Color: "&c"
    #Should this color be default? Remember only one color can have "Default" option enabled.
    Default: true
    #Permission required for default color is always the same as "Permissions.Ranked" in config.yml
    Permission: "none"
    #Slot in GUI?
    Slot: 10
    #This is the example that will be used in Lore. THERE IS NO PLACEHOLDERAPI SUPORT.
    #If not gradient, {COLOR} is replaced. If gradient, colors are removed and whole string is colorized.
    Example: "&b[MVP{COLOR}+&b]"
    #The word {DEFAULT_EXAMPLE} will be replaced with the example using default color.
    #The word {EXAMPLE} will be replaced with the example using the current color.
    Items:
      Locked:
        #Support CUSTOM_HEAD (Texture must be specified)
        #Support durability for legacy versions "INK_SAC:1" for red dye.
        Material: "RED_DYE"
        #Only if material is CUSTOM_HEAD
        Texture: "ewogICJ0aW1lc3RhbXAiIDogMTU5NDQ0NjkyMDI5NiwKICAicHJvZmlsZUlkIiA6ICJlMWMxYTE5NDdlODY0MTRmODZiYjQyZDgyYTIxY2ZiOCIsCiAgInByb2ZpbGVOYW1lIiA6ICJBbG9uc29BbGlhZ2EiLAogICJ0ZXh0dXJlcyIgOiB7CiAgICAiU0tJTiIgOiB7CiAgICAgICJ1cmwiIDogImh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMTY4YWE3NGNjODg1NzgwNjBkMGZlM2JkOTA4YjM0ZjY5ZjEyZTA3ZjFmODljNWRkYzE1ZTZiZjYwZjA0Y2NjNiIKICAgIH0KICB9Cn0="
        #Supported only on 1.14+
        Custom-model-data: 0
        Displayname: "&cRed Rank Color"
        Lore:
          - "&7The default color for &7{EXAMPLE}&7."
          - ""
          - "&cRequires &bMVP{DEFAULT}+"
      Unlocked:
        Material: "RED_DYE"
        Texture: "ewogICJ0aW1lc3RhbXAiIDogMTU5NDQ0NjkyMDI5NiwKICAicHJvZmlsZUlkIiA6ICJlMWMxYTE5NDdlODY0MTRmODZiYjQyZDgyYTIxY2ZiOCIsCiAgInByb2ZpbGVOYW1lIiA6ICJBbG9uc29BbGlhZ2EiLAogICJ0ZXh0dXJlcyIgOiB7CiAgICAiU0tJTiIgOiB7CiAgICAgICJ1cmwiIDogImh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMTY4YWE3NGNjODg1NzgwNjBkMGZlM2JkOTA4YjM0ZjY5ZjEyZTA3ZjFmODljNWRkYzE1ZTZiZjYwZjA0Y2NjNiIKICAgIH0KICB9Cn0="
        Custom-model-data: 0
        Displayname: "&aRed Rank Color"
        Lore:
          - "&7The default color for &7{EXAMPLE}&7."
          - ""
          - "&eClick to select!"
      Selected:
        Material: "RED_DYE"
        Texture: "ewogICJ0aW1lc3RhbXAiIDogMTU5NDQ0NjkyMDI5NiwKICAicHJvZmlsZUlkIiA6ICJlMWMxYTE5NDdlODY0MTRmODZiYjQyZDgyYTIxY2ZiOCIsCiAgInByb2ZpbGVOYW1lIiA6ICJBbG9uc29BbGlhZ2EiLAogICJ0ZXh0dXJlcyIgOiB7CiAgICAiU0tJTiIgOiB7CiAgICAgICJ1cmwiIDogImh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMTY4YWE3NGNjODg1NzgwNjBkMGZlM2JkOTA4YjM0ZjY5ZjEyZTA3ZjFmODljNWRkYzE1ZTZiZjYwZjA0Y2NjNiIKICAgIH0KICB9Cn0="
        Custom-model-data: 0
        Glow: true
        Displayname: "&aRed Rank Color"
        Lore:
          - "&7The default color for &7{EXAMPLE}&7."
          - ""
          - "&aCurrently selected!"
    Messages:
      Locked: "&cYou haven't unlocked (or claimed) that yet!"
      Selected: "&aSelected! Your rank looks like this now: &f{RANK}&a!"
      Already-selected: "&cYou already have that selected!"

Example of gradient color.

Colors: #Don't copy this line
  rainbow:
    #Colors separated with dash to enable Gradient mode.
    Color: "&#ff0000-&#ff7f00-&#ffff00-&#00ff00-&#0000ff-&#4b0082-&#9400d3"
    #What to add after each color? Example: &l, &n, &m
    Additional: "&l"
    Default: false
    Permission: "alonsoplus.color.rainbow"
    Slot: 31
    #This is the example for the item lores. There is NOT support for PlaceholderAPI. Don't insist.
    #If not gradient, {COLOR} is replaced. If gradient, colors are removed and whole string is colorized.
    Example: "&6[MVP{COLOR}++&6]"
    #The word {DEFAULT_EXAMPLE} will be replaced with the example using default color.
    #The word {EXAMPLE} will be replaced with the example using the current color.
    Items:
      Locked:
        Material: "TOTEM_OF_UNDYING"
        Texture: "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvN2E3ZDZjMGFjY2QyZTljY2FlZmE5NmI5NDM4ZDZlMjAyZmVjNzk1YWNmNzA3MmJjZmQ5Y2Q5ZDRiNWEzMmIwZSJ9fX0="
        Custom-model-data: 0
        Displayname: "&c&lRainbow Color"
        Lore:
          - "&7Dyes your rank color from &f{DEFAULT_EXAMPLE}"
          - "&7with colors like &f{EXAMPLE}"
          - ""
          - "&7Shown in tab list also when chatting"
          - "&7and joining lobbies."
          - ""
          - "&3Unlocked at YourNetwork Level 999"
      Unlocked:
        Material: "TOTEM_OF_UNDYING"
        Texture: "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvN2E3ZDZjMGFjY2QyZTljY2FlZmE5NmI5NDM4ZDZlMjAyZmVjNzk1YWNmNzA3MmJjZmQ5Y2Q5ZDRiNWEzMmIwZSJ9fX0="
        Custom-model-data: 0
        Displayname: "&#ff0000&lR&#ff4500&la&#ff8b00&li&#ffd000&ln&#d1ff00&lb&#46ff00&lo&#00b946&lw &#002ed1&lC&#1b00d2&lo&#44008d&ll&#6c00a7&lo&#9400d3&lr"
        Lore:
          - "&7Dyes your rank color from &f{DEFAULT_EXAMPLE}"
          - "&7with colors like &f{EXAMPLE}"
          - ""
          - "&7Shown in tab list also when chatting"
          - "&7and joining lobbies."
          - ""
          - "&eClick to select!"
      Selected:
        Material: "TOTEM_OF_UNDYING"
        Texture: "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvN2E3ZDZjMGFjY2QyZTljY2FlZmE5NmI5NDM4ZDZlMjAyZmVjNzk1YWNmNzA3MmJjZmQ5Y2Q5ZDRiNWEzMmIwZSJ9fX0="
        Custom-model-data: 0
        Glow: true
        Displayname: "&#ff0000&lR&#ff4500&la&#ff8b00&li&#ffd000&ln&#d1ff00&lb&#46ff00&lo&#00b946&lw &#002ed1&lC&#1b00d2&lo&#44008d&ll&#6c00a7&lo&#9400d3&lr"
        Lore:
          - "&7Dyes your rank color from &f{DEFAULT_EXAMPLE}"
          - "&7with colors like &f{EXAMPLE}"
          - ""
          - "&7Shown in tab list also when chatting"
          - "&7and joining lobbies."
          - ""
          - "&aCurrently selected!"
    Messages:
      Locked: "&cYou haven't unlocked (or claimed) that yet!"
      Selected: "&aSelected! Your rank looks like this now: &f{RANK}&a!"
      Already-selected: "&cYou already have that selected!"