Display boot splash graphic in GRUB for smoother visual experience

During Ubuntu boot there are a few seconds after GRUB has loaded that most PCs just display a black or dark purple plain screen, before Plymouth starts and displays the nice Ubuntu boot animation. Why shouldn't we use this time to display a static boot splash image, such as the first frame of the Ubuntu Plymouth animation?

An example image: https://dl.dropboxusercontent.com/u/9091715/ubuntu-boot.png

I set this as the GRUB background and it gives a much nicer appearance that the computer is doing something during boot. (GRUB runs at 1920x1080 for me and I have disk encryption so my boot process might be slightly different to others').

Is this something we should be doing in Ubuntu installations by default?