I don't know, if the MyLiveCs problem will be solved, then I will try to change the themes as you suggested. Btw, is there not a kinda GUI program that enables me to make my own plymouth themes?
Yes, there is one. The generic name is console.
As a matter of fact, it is a gui ! Else it would be a virtual console (tty) or a dos environment ? So you can choose among a few ones : konsole, gnome-terminal, xfce4-terminal, lxde-terminal, sakura, rxvt, xterm... You can even put colors in some of them, with the gui preference in their menus !!! How can you say there is no gui to configure all and everything when there is such a large choice ? Come on !
Please, open a thread about how to create your own plymouth splashscreen ! I have done one following instructions, I have opened and recreated an archive, and I still have a pair of small questions about how to do it the best way... I would be happy to follow and participate to such thread and probably it will be a very interesting one, that quite a few people might participate to.