robbyrussell/oh-my-zsh — pull request #2176 by dejanlukan (2013-10-16 13:41:10+00:00)
Title: Added the spectrum_bls function, which prints all 256 colors set as the background.

We can easily see which color we want to set when changing the PS1 shell variable,
since the colors are more distinctive.

This can be used by executing the following command in command-line:

# spectrum_bls