Timewarrior uses color, and supports color themes. The colors are used for assorted highlighting, and for coloring tags on charts. Themes are optional, but can improve your experience.

To use a theme, you need a line added to your ~/.timewarrior/timewarrior.cfg file, like this:

import /usr/local/share/doc/timew/themes/dark.theme

That path is platform-dependent, so yours may differ.

There are four themes included in the release: dark.theme, dark_red.theme, dark_green.theme, and dark_blue.theme. Consider making your own and sharing.