Credit to @lemnos and all contributors.

Currently, the theme change has to be a bit manual. To have access to the list of all the themes,

ls ./themes/nu-themes

To use the dracula theme for instance, please run

use ./themes/nu-themes/dracula.nu
$env.config = ($env.config | merge {color_config: (dracula)})

The theme should be activated!

• install Nupm by following the Nupm instructions
• download the nu_scripts repository

git clone https://github.com/nushell/nu_scripts

• activate the nupm module with use nupm
• install the nu-scripts package

nupm install --path --force nu_scripts

Note installing the nu-scripts package will install nu-themes and other modules

• now, add the following in your config

use nu-themes/nushell-dark.nu
$env.config.color_config = (nushell-dark)

Here are screenshots of our themes.