Modern
Modern gives the Matomo user interface a minimalist look and feel.
GTheme
A mimimal Matomo theme.
Dark Theme
A modern dark theme for Matomo.
Google Theme
A sublime Google Analytics theme for Matomo.
Alternative Sparklines
a minimalistic alternative to the default sparkline style.
Classic Font Theme
Matomo (Piwik) Platform showcase: example of how to create a simple Theme.