At one time I had a job that required managing servers remotely from a Windows device and PuTTY was the tool of choice. PuTTY's default colors are awful (just like every other terminal's default color scheme) and I especially have trouble with darker blues because of slight color-blindness, so I decided to make a theme that was easier on the eye with some nice, even hues. I'm super satisfied with my hand-picked colors. It's also pretty solid for other design work, so I've included a .GPL version of the "moonbase" palette for use in any graphics tool that supports that file format.
187,187,187 Default Foreground 255,255,255 Default Bold Foreground 21, 17, 17 Default Background 85, 85, 85 Default Bold Background 0, 0, 0 Cursor Text 241, 77,218 Cursor Colour 0, 0, 0 ANSI Black 70, 70, 70 ANSI Black Bold 207, 55, 55 ANSI Red 236, 82, 82 ANSI Red Bold 120,201, 78 ANSI Green 159,229,120 ANSI Green Bold 188,188,112 ANSI Yellow 229,229,138 ANSI Yellow Bold 76,113,169 ANSI Blue 92,144,220 ANSI Blue Bold 142,109,192 ANSI Magenta 170,133,228 ANSI Magenta Bold 67,186,179 ANSI Cyan 123,221,215 ANSI Cyan Bold 215,215,215 ANSI White 255,255,255 ANSI White Bold
While writing this page I found some great resources for PuTTY colors. There is a giant repository on GitHub with around 50 themes originally from a Russian site, and a developer from Poland wrote a theme generator called the 4bit Terminal Color Scheme Designer. It's a cool tool to get you started but I think colors should always be tweaked by hand based on perception.