HOWTO change plymouth theme in ROSA
Plymouth is an application (bootsplash) that runs very early in the boot process (even before the root filesystem is mounted!) that provides a graphical boot animation while the boot process happens in the background .
By default ROSA comes with minimalistic grey plymouth theme "Mandriva-Rosa".
If you wish to change it for some other theme you should do the following (will take the bluish MIB Ossigeno Ultimate Plymouth theme as example):
1) download the theme archive
2) extract the folder and copy it as root in /usr/share/plymouth/themes (the full path will be /usr/share/plymouth/themes/MIB-Ossigeno-Ultimate-Plymouth)
3) remove the folder /usr/share/plymouth/themes/Mandriva-Rosa or rename it ('Mandriva-Rosa.old' for example)
4) insert as root
plymouth-set-default-theme MIB-Ossigeno-Ultimate-Plymouth /usr/libexec/plymouth/plymouth-generate-initrd /usr/libexec/plymouth/plymouth-update-initrd
Reboot and enjoy watching :)