GNOME Terminal has a few built-in color schemes:
How can I add more to this list?
Although there is a similar question at Unix&LInux, I can perhaps add some new information and expand some of the points made there in order to give you a few useful pointers. However, it is true to say that you cannot add another 'built in' scheme to the menu as those existing ones are defined in the source code, as you can see if you examine the latest code release.
You could of course patch the source to include your scheme in the choices and then compile the program, but there are some other alternatives which centre around scripting and which I discuss further below.
If you created a color scheme by experimenting with the menus (as in the screenshot below),
you could back it up by noting the instructions in this answer:
Or you could run
So it seems that scripting is the easiest way to apply or reapply your color scheme settings to any
It would seem to be possible to adapt the method used for scripting the solarised color scheme, and substitute your own color palettes, etc. After running in terminal
and then using
It should be possible to create your own custom profile and then change the values of the files in the colors folder, and tweak the scripts if necessary, and then you should be able to apply and reapply your own color scheme, just like you can with the solarised scheme.
If you want to produce a really interesting and original color scheme you might need to do some reading and research from here and other sources on terminal color schemes, and which are best for long periods of terminal usage.
From this answer, the color palettes list is hardcoded, so you can't edit it.
But you can simulate that list with bash script files, where each file is a color palette.
This awesome project might help to build these scripts:
This small script (from the Tomorrow Night theme), besides being an older version will get the job of installing the said theme, and is also rather easy to comprehend.