Sorry, I'm a bit confused. Are the grub and plymouth themes working now? Why would there be a link to the plymouth theme folder in the gfxboot directory if you are running switch-themes from the /usr/share/plymouth/themes folder?
I don't handle all the way about how it works, but one thing is sure is the the switch-theme accepts just 3 options:
switch-themes OPTIONS THEMES
-c: Tell you the current themes
-l: List themes available.
-u: Update current theme.
Which means that when you use the "-l" switch it gives the list as it finds it. And it was giving me "pclosedu_plymouth". Then only I realized that it had created the symlink as I have shown above : in the gfxboot section.
So, comparing in Openbox desktop, where the theme name is everywhere "PCOBOX", and in Lxde desktop, where the theme name is everywhere "Lxde" (or LXDE ? I don't remember now but it's everywhere the exact same name) I could notice that we can't guess what did create the symlink. Apparently switch-theme takes care of doing what it necessary for the whole stuff to work, even in creating links in gfxboot based on the theme name in the plymouth section.
By changing the name all the way long to "pclosedu", in the plymouth files (*.plymouth and *.script, plus file names and directory names), it works.
I added an additional symlink that loops to itself, in /usr/share/gfxboot/themes/pclosedu, in the same way as I found the one in /usr/share/gfxboot/themes/PCLinuxOS. And did as Neal : have a copy of the theme image files both in pclosedu and in PCLinuxOS. ^^
Does that work ? I will let you discover, if you will download and install it. Do you have one or more young testers at home ?
Thank you very much for this wonderful theme ! I will ask someone to package it !