Well… This is Fog 1.0.1 We haven’t had time to write new wiki articles regarding adding items to the iPXE system. But this guide will not work for you. We no longer serve from the /tftpboot/pxelinux.cfg/default file, so these settings will not work for you.
We also upgraded the system from pxe to ipxe, thus the commands listed on this wiki will not work for you.
Instead, please take a look here -> [url]http://fogproject.org/forum/threads/fog-0-33b-edit-pxe-menu.10403[/url]
This will assist you in creating a custom menu on the new ipxe system.
As far as changing your graphics, I will assume you mean the back ground image? If that is the case, everything is served from your /var/www/fog/service/ipxe you will want to edit the background.png image there.
please note if you are on ubuntu 14+ you need to look in /var/www/html/fog/service/ipxe