Where to get images for HMI type displays

Hello
I am trying to make HMI type of displays for the equipment I have. I can see that this can be partially managed by this example
https://community.home-assistant.io/t/water-tank-level-multiple-sensors/419041

But this is for static images. So may question is -
a) Where on web we can find images (eg - GIFs of AC running with gas rotating via the compressor - OR - Pool pump running with water corculating in pool).
b) Is the above link the only way (it will be so dificult to implement different images using different sensors)

Some exampels will be highly appreciated.
(I am looking for displaying HMI type animation which I see in so many plat equipment)