Xsplash is the theme which you will see during ubuntu booting process!
Step 1] Go to the directory – “/usr/share/images/xsplash”
root@me:~# cd /usr/share/images/xsplash
*** Take backup of original theme –
root@me:/usr/share/images/xsplash# cp -fr /usr/share/images/xsplash/ /usr/share/images/xsplash-original
Step 2] Download Xsplash themes –
Step 3] Copy this theme files to /usr/share/images/xsplash/ directory and check the xsplash using ‘xsplash’ command.