Can xdm display a high res background image?
After much experimentation with xdm config files I was able to have it come up in -32 bit mode which I guess also told it to hit 1600x1200 since that's the only mode I allowed. :) That was good, but frankly the moires that show up with that nasty grey background are more than can be bared! I found where they are calling the colors (I think) in /etc/X11/xdm/Xresources:
xlogin*Background: white <--- bingo!
Is there a way I can tell xdm to use a nicely rendered .jpg, .png, etc?