How can I create a library of pictures used during the Group creation process?

Hello

I try to standardize the creation of my Group (international/French marathon runners).

In particular, I want to control he small picture on the bottom left of the Group big picture (see file Capture2 attached).
I would like that the Group creator select one of a pictures already set in a Library.

If it is possible then I will upload our set of pictures into this library, ready for user who want to create e Group (and en Event).

Thanks
Henri



.