Calm Matters: a calm, colourful Obsidian theme (Light and Dusk), made to go with the Matters that Matter plugin.
A calm, colourful theme for Obsidian: a warm paper page, soft platinum sidebars, pastel accents and a friendly serif for titles. Dusk, its dark mode, stays colourful instead of turning grey.
It's made to go with the Matters that Matter plugin, a board, list, calendar and timeline where every card and every lane is a note, and it works just as well on its own.

Light has a warm paper page, soft platinum sidebars and pastel accents. Dusk is the dark mode: deep violet surfaces with lighter pastels.
Switch between them with Obsidian's own setting, under Settings → Appearance → Base color scheme.

The plugin brings its own styles and works with any theme. With Calm Matters, its board, inspector, list, calendar, timeline and Matter pages pick up the serif titles, pinstriped headers and calm gradients, quick add turns frosted, and Action notes get the same paper and pastels as the rest of your vault.
To add the plugin: Settings → Community plugins → Browse, search for Matters that Matter, then Install and Enable.

The theme picks a sky blue that suits each mode. For the best result, leave Settings → Appearance → Accent color on its default.
With the Style Settings plugin you can choose the accent (sky, lavender, mint, bubblegum, peach or butter), turn off the folder colours, use sans-serif headings, hide the welcome message, or remove the gradient behind empty tabs. Everything works without Style Settings too.
From Obsidian: Settings → Appearance → Themes → Manage, search for Calm Matters, then Install and use.
By hand: copy theme.css and manifest.json from the latest release into <your vault>/.obsidian/themes/Calm Matters/, then choose it under Settings → Appearance → Themes.
Theme code: MIT, see LICENSE. Embedded fonts (Figtree, Young Serif, JetBrains Mono): SIL Open Font License 1.1, see OFL.txt.