/etc/default/grub

 GNU nano 2.3.1                File: /etc/default/grub

GRUB_GFXPAYLOAD_LINUX=1680x1050x24
GRUB_DISTRIBUTOR="Gentoo"
GRUB_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_DISABLE_OS_PROBER=true
GRUB_DEFAULT=Gentoo GNU/Linux, with Linux 3.5.3
GRUB_GFXMODE=1680x1050x24
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_THEME="/boot/grub2/themes/starfield/theme.txt"
GRUB_HIDDEN_TIMEOUT=0
GRUB_CMDLINE_LINUX=""
GRUB_BACKGROUND=/home/daniel/bin/iconite+walpapere/ptstartup.png