There are multiple projects out there that provide better functionality and are under active development.

Have a look at tinted-theming and mini.base16

See the Base16 repository for more information.
These scripts were built with Base16 Builder Go.

A pure fish shell solution to change your shell's default ANSI colours but most importantly, colours 17 to 21 of your shell's 256 colorspace (if supported by your terminal). This script makes it possible to honour the original bright colours of your shell (e.g. bright green is still green and so on) while providing additional base16 colours to applications such as Vim.

Heavily inspired on Base16 Shell

• You want to use a *.256.* variant of a Terminal theme designed to honour the original bright colours.
• You prefer to use a script instead of a terminal emulator theme to colour your shell.
• You use this script to have different colour schemes appear on different SSH sessions.

With oh-my-fish

omf install https://github.com/FabioAntunes/base16-fish-shell

With fisher

fisher install FabioAntunes/base16-fish-shell

Open a new shell and type base16 followed by a tab to perform tab completion.

• Pure fish solution, no need to source bash functions.
• Sets one universal variable with the current theme. Whenever a new interactive session has started, a function in conf.d will apply the theme's function.
• Luma calculation, a global variable base16_fish_shell_background is set with the background. Possible values are dark or light Base16-vim support

Fish shell has universal variables with colours. These universal variables are responsible for the theme of the prompt. You can see your current colours and modify them using the interactive webpage using the command fish_config

When you select a scheme, base16-fish-shell will shadow the universal variables with global variables. If you prefer not to change the fish prompt colours, you can disable this by running the following:

set -U base16_fish_shell_disable_prompt_colors true

This will only disable things like colours for autocompletions, errors, commands, strings.

Here's the complete list of the colours modified by the scripts:

fish_color_normal fish_color_command fish_color_quote fish_color_redirection fish_color_end fish_color_error fish_color_param fish_color_comment fish_color_match fish_color_selection fish_color_search_match fish_color_history_current fish_color_operator fish_color_escape fish_color_cwd fish_color_cwd_root fish_color_valid_path fish_color_autosuggestion fish_color_user fish_color_host fish_color_cancel fish_pager_color_completion fish_pager_color_description fish_pager_color_prefix fish_pager_color_progress 

Every time you run a base16 function, it will update ~/.vimrc_background file with the current colour scheme. You need to source this file in your .vimrc: i.e. (remove the base16colorspace line if not required)

if filereadable(expand("~/.vimrc_background")) let base16colorspace=256 source ~/.vimrc_background endif

The script will also calculate the Luma of the background colour of each theme, setting your vim background to light or dark accordingly.

Run the included colour test option and check that your colour assignments appear correct. If your terminal does not support the setting of colours within the 256 colour space (e.g. Apple Terminal), colours 17 to 21 will appear blue.

To run the test, pass the flag -t or --test to any theme functions.

base16-solarflare -t

This is the expected behaviour when using a light theme: https://github.com/chriskempson/base16-shell/issues/150