Here's my take:

May need a bit of tweaking though to suit your tastes, especially light mode. The current color options are a bit limited.

{
  "monet_override_light_secondary_text_color": "#93A1A1",
  "monet_override_light_primary_text_color": "#657B83",
  "monet_override_light_link_color": "#073642",
  "monet_boost_light_color": false,
  "monet_override_dark_secondary_text_color": "#657B83",
  "monet_override_dark_primary_text_color": "#93A1A1",
  "monet_override_dark_link_color": "#B58900",
  "monet_boost_dark_color": true,
  "monet_color_intensity": 0.6,
  "monet_manual_theme_color": "#002B36",
  "monet_system": false
}

{
  "monet_override_light_secondary_text_color": "#93A1A1",
  "monet_override_light_primary_text_color": "#657B83",
  "monet_override_light_link_color": "#073642",
  "monet_boost_light_color": false,
  "monet_override_dark_secondary_text_color": "#657B83",
  "monet_override_dark_primary_text_color": "#93A1A1",
  "monet_override_dark_link_color": "#B58900",
  "monet_boost_dark_color": true,
  "monet_color_intensity": 0.6,
  "monet_manual_theme_color": "#002B36",
  "monet_system": false
} 

I don't think it's possible with the current theming method.

I've been using the one from this post: reddit post

{ "monet_override_light_secondary_text_color": 0, "monet_override_light_primary_text_color": 0, "monet_override_light_link_color": "#C69843", "monet_boost_light_color": false, "monet_override_dark_secondary_text_color": 0, "monet_override_dark_primary_text_color": "#FFFFFF", "monet_override_dark_link_color": "#EEBF7D", "monet_boost_dark_color": true, "monet_color_intensity": 1.4, "monet_manual_theme_color": "#F8DAA1", "monet_system": false }

From there maybe you can add some color to headers, user names, and other small indicators. I enjoy the background color the most with this theme.