DIY Make headings more or less colorful

This is one of our practical examples to override the semantic colors of the Modus themes (Stylistic variants using palette overrides). Here we show how to alter the looks of headings, such as in Org mode. Using overrides here offers far more flexibility than what we could achieve with previous versions of the themes: the user can mix and match styles at will.

Make TODO and DONE more intense.

;; Apply more colorful foreground to some headings (headings 0-8).
;; Level 0 is for Org #+title and related.
(setq modus-themes-common-palette-overrides
      '((fg-heading-1 blue-warmer)
        (fg-heading-2 yellow-cooler)
        (fg-heading-3 cyan-cooler)))

;; Like the above, but with gradient colors
(setq modus-themes-common-palette-overrides
      '((fg-heading-1 blue)
        (fg-heading-2 cyan)
        (fg-heading-3 green)))

;; Add color to level 1 heading, but use the main foreground for
;; others
(setq modus-themes-common-palette-overrides
      '((fg-heading-1 blue)
        (fg-heading-2 fg-main)
        (fg-heading-3 fg-main)))

;; Apply colorful foreground, background, and overline (headings 0-8)
(setq modus-themes-common-palette-overrides
      '((fg-heading-1 blue-warmer)
        (bg-heading-1 bg-blue-nuanced)
        (overline-heading-1 blue)))

;; Apply gray scale foreground, background, and overline (headings 0-8)
(setq modus-themes-common-palette-overrides
      '((fg-heading-1 fg-main)
        (bg-heading-1 bg-dim)
        (overline-heading-1 border)))

Reload the theme for changes to take effect.