My Little Pony: Friendship is Magic Applejack GRUB Theme
Ponies belong to Hasbro.
Wallpaper image I used belongs to its respected owner (I can't find who made it).
To install, unarchive the tar file, then cd into the folder you put it in, then execute the install.sh script with root privileges (sudo ./install.sh). Reboot and enjoy!
Updated: Added necessary files so it can work with Early Bird.
Early Bird can be found here: