OK, my grub.cfg file:
--------------------------------
GRUB_GFXMODE=800x600
set color_normal=red/black
set color_highlight=yellow/black
insmod png
background_image /yeah.png
menuentry "KJARTANS PISSEKULE TAHRPUP" {

    linux /vmlinuz

    initrd /initrd.gz

}
menuentry "SHUT DOWN" {
	halt
}
menuentry "REBOOT" {
	reboot
}
---------------------------------

menuentry : just change to whatever u want between the "   "s.

and background_image: choose your own! (.png)

I,m kindof drunk now - on some rose wine.

Cheers :-)