@Xzara your character design needs to be grounded in some kind of reality that the viewers don’t need to work too hard to figure out. In your example of elephant doing yoga, we are familiar with the shapes of elephant (Long nose, big ears) and the basics of some yoga poses separately. If you take away the heaviness of the elephant, you still have the shapes to clearly show it as an elephant.
Ask yourself, if you take away the rigidity of the stone, what will be left? Texture? Colour? Is it enough for the average viewers to tell that it is a stone?
Or you could go into movements of groups of gravels? For this you may want to study those ASMR YouTube videos of flowing sands, marble pouring, etc?