Often Terms of Use demand certain rules for images (copyright, netiquette, ...) and sometimes errors result in broken images.
For a short visual check of all profile and profile background images an overview (grid with pagination) for admins could be useful.
There should be filter options for "only default images" (to find people without own image), "only non-default images" (for TofU checks), "only broken images" (for images with upload errors, resulting in file size 0 or similar errors).
Stretch goals: ;-)
Provide filters for profile fields. (Have all users from Marketing or Singapore set up images?)
Provide RegExp-Filters to find images with broken/changed file names.