Custom color for calendar, events and mail themes
I recently switched from Google to PM, but I have to admit that the graphic style of PM is a bit of a disappointment, with this bright purple and very limited palette. Some like it, others don't. I liked Google's a lot, tbh. It would be nice to have the possibility to customize the themes of the mail (send button, accent colors, and stuff like this) or at least pick custom colors for mail labels, events etc. so that each user can make the experience more appealing.

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sara commented
I know this is just a matter of taste - but truly, I loathe Proton's shade of purple. It aggravates me every time I open the app. I tolerate the purple because Proton is a great product in other ways, but please.... add a few color options to the template menu under "appearance." I don't actually care about switching between snow and carbon (or whatever the light/dark options are). But please allow me to choose a color other than purple as the main color seen throughout the app!
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Mathias Hellquist commented
I came here to suggest exactly this, so I'm adding votes on this one instead. :)
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Only Annie commented
Existing themes are very stark: either all very dark or with extreme contrast that is hard on my eyes. Often the popups are hard to distinquish because they are the same or similar to the background. I need a more restful theme, and would like to be able to adjust the elements so they are comfortable for me to use. At least please make it possible for users to adjust color and depth of color of background and sidebars. For me this is an accessibility issue.