Antoni, the author of Pinguy OS sent us a tip on installing MIB-Ubuntu Plymouth theme in Ubuntu - that's a theme based on Mandriva 2010.1 - and I must say, it looks amazing!
To install MIB-Ubuntu Plymout theme, do the following:
Firstly, download it from Deviantart.
Then extract the contents of the zip to your home folder, then open a terminal and run this (firstly navigate to the folder where you extracted it using a terminal; if you extracted it on your Desktop, that would be: cd ~/Desktop):
sudo cp -R MIB-Ubuntu/ /lib/plymouth/themes/ sudo update-alternatives --install /lib/plymouth/themes/default.plymouth default.plymouth /lib/plymouth/themes/MIB-Ubuntu/MIB-Ubuntu.plymouth 100 sudo update-alternatives --config default.plymouth #here, choose the number of the theme you want to use then hit enter sudo update-initramfs -u
Please note that I didn't test this (I'd had to fix my Plymouth all over again and I don't have time right now), but Antoni tested it (in fact he sent us the installation instructions too) so it will work if you follow that exact steps.
Many thanks to Antoni for the tip!