I would like larger user pics/avatars. I think SA's 180x180 limit is perfect.
For years I felt twitter and other social media's constant shrinking of the User Pic/Avatar was a crime against legibility. I also think if user pics/avatars were larger, artists would get more commissions for custom ones.
This also helps those of us with larger than 1080p displays who refuse to scale in windows/browser because of how poorly windows handles scaling.