Menards has animation on some of their buildings, with the rotating vents like on the Red Owl store. And of course the animated signage.
I have a rotating beacon on my layout, and the oil derrick with animation in the bubbling and the "nodding donkey" action.
A On30 line could be considered as an operating accessory. Like the Bachmann highly detailed and smooth running trains. Either as a loop or a point-to-point line, perhaps elevated or in the mountains. Here is a recent layout plan I have been working on, where an On30 is an operating accessory to add interest and action to a layout:
