Holiday Picture Avatars?

I noticed that when some people post their avatar is one of the holiday pics background...

Is there an option to apply this to my account? or does anyone know how this happens??

:confused::confused:

I believe it happens after you complete the most recent seasonal quest. It may trigger about 24 hours later.

You may need to log out of your FFXIV Forum and log back in.

We cannot choose which individual seasonal attire we wear (I can't choose my Dream Hat or Summer Festival background.

I've been seeing people who have recent posts with old holiday events as their avatars, so i still don't understand