burg theme inspired by tron legacy stuff. based on fortune theme, but icons are made by myself. by default there is choice of ubuntu and windows, but I included font and photoshop template, so anybody can easly change the operating system choice.
Edit /etc/default/grub file. Find the line starting with "#GRUB_THEME" and change it to "GRUB_THEME=/boot/grub/themes/[THEME_FOLDER]/[theme.txt]" (replace [THEME_FOLDER] ; [theme.txt] is probably OK ; remove "" brackets)