I work on the CLI for a PaaS. So lots of interaction, detailed output for your apps and their status, etc. Probably a less interesting answer than you hoped.
I started adding colors to highlight important parts of the output (e.g. app names, status, ...), but received a bunch of complaints from people who couldn't read parts of the output. Turned out they were just using bad/broken themes, like Solarized, which abuses the bright palette by replacing them with various unreadable shades of blue.
It's otherwise a pretty nice color scheme. Just annoying that I can't trust the "bright" palette to ever be readable because of themes like it.
(Also, the themes that come with Terminal.app are pretty abysmal. The stock 'blue' isn't even readable in some common configurations.)
