Description
First of all, thanks for creating the Modus themes :).
Recently, I've been enjoying using Howm. I'm not sure if you're familiar with it; it's a minor mode for managing a personal wiki in Emacs, which can be used together with any plaintext filetype (Org, Markdown, etc.). It has some pretty cool features, like the emphasis on "self-organization" of notes and the ability to create "comefrom links" (as opposed to the more traditional "goto links"). Documentation is available here.
Unfortunately, the Modus themes – and most other themes – don't currently theme the faces defined by Howm, and the defaults are IMO quite intense. For instance, here is a screenshot of the Howm note list when viewed using the modus-operandi-tinted theme:
Perhaps the Modus themes could alter the faces used for Howm?