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I’m not nearly artistic enough to come up with something that looks good. I never bothered to customize my Lock Screen for the same reason.
 
It doesn't seem that the posters sync with iCloud? I had to sign out of iCloud and when I signed back, my updated Contact photo/poster and ones I made or a few of my contacts reverted to the pre-IOS 17 versions.
 
Coming back to this topic: as more of my people are updating to 17.x, I’m realizing I don’t like all of their contact poster choices.

I appreciate that I can easily switch back to a picture/graphic of my choosing, even when they have added their own.
 
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