randomizing can make you stand out more as an outlier
I’m sure, but if you have a specific set of colors matching a specific picture on your phone that nobody else has, I imagine that would be more easily traceable than if it were automatically switched out every once in a while. Granted, the other aspects you mentioned might be enough to just render the effort redundant anyway.
I can see why your friend would assume you could hack their phone based on how specific these steps are.