Make any ISO bootable from USB Using grub4dos

wget http://download.gna.org/grub4dos/grub4dos-0.4.4.zip; unzip grub4dos-0.4.4.zip 

mkdosfs -F32 -I /dev/sdb1 #format usb FAT32

./grub4dos-0.4.4/bootlace.com /dev/sdb #make usb bootable

mount /dev/sdb1 /mnt; cp grub4dos-0.4.4/grldr YOUR_IMAGE.iso /mnt

cat <<EOF > /mnt/menu.lst

title bootable-usb

map (hd0,0)/disk.iso (hd32)

map --hook

chainloader (hd32)

boot
EOF 

Reboot and select booting from USB.

BIG THANKS to http://www.thinkwiki.org/wiki/BIOS_Upgrade#Booting_from_a_USB_Flash_drive