Base16 Terminal provides Base16 themes to select from and apply to your VSCode terminal.
Usage
Note: A folder or workspace should be open to change Terminal theme
Open Command Palette.
Type or Select Set Terminal Theme command.
Search for a specific Base16 theme or use Up/Down keys to preview the themes in the list.
Press Enter or select theme from the list to apply. Press Esc or click outside the list to cancel.
Command Remove Terminal Theme is also available to remove any color customizations to the terminal and revert to the default, however, it's unable to determine whether the customizations have been touched manually or by some other extension as well, so it should be executed at the risk of losing any such changes.