Dark colorful theme for Cura 3.1
Move the aqua-dark
folder to the themes folder in the Cura data folder:
$User/AppData/Roaming/cura/$CURA_VERSION/themes
$User/Library/Application Support/Cura/$CURA_VERSION/themes
$User/.config/cura/$CURA_VERSION/themes
Restart Cura if it is open and select the theme in the preferences window.