The login screen wallpaper in OS X Mavericks is a pretty boring dark gray linen picture, with the Apple logo in the center. Yawn.
Far better to put in your own image, thereby customizing the login screen for your very own purposes, am I right? It’s not too tricky to do so, though it does require replacing some system files and will get rid of the Apple logo image itself.
If you don’t mind replacing that Apple logo with a much larger image, thereby hiding the linen look but losing the Apple logo, then here’s how to do just that.