It’s late at night in my timezone, I can’t sleep, and I didn’t know what to do, so I played around with GIMP for about a minute and came up with a very simple, not at all fancy, retro-looking wallpaper for login screens.
You see, when I was a small child, the first computers that my family had ran on MS-DOS. As a result, I still sometimes like to look at something that looks a bit like DOS. Not all the time, not even most of the time, but every now and then. So, ideally, I’d like to use a fully TUI-based greeter and login screen. But I don’t have the skills to program something like that, and even if I did, I probably wouldn’t have the time. So instead, I’ll settle for a wallpaper specifically for login screens that makes it look a little bit as if I had a TUI-based greeter.
Here we go:
I am not prepared to call text-based terminal login "silly", but what exactly do you want to do?
- display blue screen;
- offer dropdown-rolodex-button to choose username; and
- input box for password ?
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Yes, basically. Perhaps with added options to shut down or reboot if something goes wrong with the login.
Would you be expecting to login to a full-blown GUI+DM from that "blue screen"?
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Then you are likely looking at a customization of what is called the "slick-greeter", which would be managed by "LightDM".
There are other postings here, by Members, covering various aspects of switching to (if need be) or setting up the slick-greeter.
As for customization of that, the information is a bit scarce.
From what I can gather, the "master" site is at
Old (likely outdated) reference about lightdm customization:
Also, keep in mind that you could "tweak" using parameters available to you using dconf-editor
and search for "slick". Just be careful when using that tool. 
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Thank you, for now, I settled on the lightdm gtk greeter instead. I quite like the way I configured it.
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