Why do I have the gray linen sign in screen?

Please help:  Using mid-2011 Imac, upgrading to Mac OS X 10.8.5 Mountain Lion (12F37), I have had THREE different sign-in screens:  first Gray Flannel, then Light Blue and now Gray Linen.  I do not know what caused these changes; Apple Care's tech advised:  "Don't worry, be happy."
I'd be less worried and more happy if somebody could tell me more about this.  Many thanks.

I have file vault 2 enabled.  I do not have multiple monitors and never have had.  There are no other users except myself. 
The Light Blue log in screen is for users who are part of a managed network...does not apply to me (so far as I know...unless somebody adopted me in a hostile takeover am I totally unaware of -- aka "via hacking") either.
Therefore, I am multiply stumped.
I'd imagine Grey Linen is a bit of a step up from Light Blue; however maybe not in the case that a connection to some kind of "virtual" monitor might exist?

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