How do I resize the Plymouth screen or do I need to resize the images.
If you go into terminal and run gdmsetup, then click the local tab, and then select
other screens will change the login screen.
In /boot/grub/menu.lst you could erase "splash=silent" to eliminate that screen.
In LXDE there's a configuration menu option called EZSwitch. Look in there for
other screen selections also.