.
(...)
To get a proposal considered, you will have to present a _complete_
proposal. This includes at the very least:
- a banner
- a background or background color
- a color scheme for gui elements like the progress bar
- icons
- patches :-)
- a netboot-gtk (gtk-miniiso) image built using all these that d-i people
  can try to evaluate the proposal (this is not as hard as it sounds,
  AFAIK there are plenty of people involved in debian-desktop who have the
  skills needed to build a modified image)
Cheers,
FJP
[1] http://wiki.debian.org/DebianDesktopArtwork/DebianInstallerEtch