I want to do this for my raspberry pis since they don't have an ACPI system in place. I think it would look really nice combined with XFCE and the chicago95 theme. So I would prefer it if it were showing it like the windows 95 shutdown screen, maybe using an image file? There's a lot of information on the shutdown process on linux but not much on the topic of altering it.
Once you've figured this out, tell me about it please! :-D
I was just thinking about how I miss this screen the other day haha