Both, I didn't even know you could change the boot screen image.
The boot screen pic needs a little hacking done, but I can serve those purposes. ;) The logon screen only needs, depending, a single tool (to simply change it) or a set of pretty easy-to-use tools (to make your own).
Quote from SABERinBLUE:
EDIT: Notepad's at the top of the Start Menu. Rawk.