I just published version 0.4.0 of the Modus themes. These are my highly-accessible themes for GNU Emacs. They conform with the WCAG AAA standard for colour contrast accessibility (a minimum contrast ratio of 7:1 between the foreground and background values). You can find the packages on MELPA:

• modus-operandi-theme (light)
• modus-vivendi-theme (dark)

This is an overview of the changes since version 0.3.0 (2019-12-25).

Add support for:

• ert
• flycheck-indicator
• mentor
• mu4e-conversation
• powerline-evil
• telephone-line
• vc (built-in version control)

Refinements to already-supported packages:

• company-mode (several refinements)
• doom-modeline (major review)
• helm (several tweaks)
• hl-line-mode (use unique background)
• ivy (improve matching line)
• line-number-mode (minor tweaks)
• markdown-mode (comprehensive expansion)
• mode-line (more appropriate styles for the highlight)
• powerline (minor tweaks)
• region (use unique background)
• swiper (improve matching line in main window)
• whitespace-mode (several refinements)
• mu4e (tweak mu4e-modeline-face for consistency)

Miscellaneous:

• Fix actual and potential problems with cursor faces that would distort the use of appropriate background and foreground colours. The documentation stipulates that the cursor face cannot be inherited by other faces, due to its peculiar nature of only recognising the background colour.
• Add support for more bold constructs in code. As with all such options, it is disabled by default, expecting the user to explicitly opt in.
• Declare additional custom faces. Only meant for internal use.
• Subtle refinements to “active” colour values in both Modus Operandi and Modus Vivendi. These mostly concern the mode line (with a few special exceptions), where emphasis has been placed on the need to provide greater contrast between accent values that can be used there.
• Minor documentation refinements.

For more information, check the git repository of the modus-themes.