Hello!
Having a huge number of usergalleries (100++) it would be awesome to navigate through the usergallery-category to find a specific user's gallery.
I suggest to have an additional alphabetical partitioning of the users' galleries. So the galleries could be split up by the first letter of a username to a more handy number of usergalleries in each category.
i.e.:
usergalleries
-A
-Adam
-Angus
-B
-Bert
-...
......
(just a code environment to save the spaces)