It’s relatively easy to install, if you know how to do it: http://community.linuxmint.com/tutorial/view/1357
Requires manual configuration... A bit... http://linuxers.org/howto/how-change-grub2-splash-images - http://forums.linuxmint.com/viewtopic.php?f=46&t=53306&p=309887
Good selection of images. Requires either another package or manual configuration to set them as backgrounds for Grub2.