Can I add custom colors to Options>Appearance

Or change the colors of a few of them (on Ubuntu 12.10 minimal + Fluxbox)?

Thank you, Jean-Baptiste FAURE. Sorry for not being able to upvote because of 15 points requirement.

No. You can do that in menu Tools > Options > LibreOffice > Colors

Ubuntu 12.04
Add Your Custom Color in LibreOffice

If you like to write in your own custom color for your presentation or blogging.
But Libre office comes in with own color
option. Here is the solution on how to get your custom color.

Here is the video url
http://www.youtube.com/watch?v=lDuevzjSH9c

It would be nice if you could summarize the procedure, in case the external reference somehow became unavailable.

It would be nice if you could summarize the procedure, in case the external reference somehow became unavailable.