OVERKILL have a lot of paintings set up for the Art Gallery, seen in the "Art Gallery" contract, and "Framing Frame: Day 1", that go unused. This restores them.
This will only work if you are hosting, or in offline mode. You will also see them if the host has the mod, but you do not. It won't cause sync issues.
This does not modify the paintings loot value etc., it's purely visual.