Here is a fantastic tree I’ve found online created by Ed Trout which is a willow leaf ficus.
It is a great design which is a root over rock. It looks like he’s grown it over the rock for a good few years to increase the root size and then switched it onto it’s side. It’s an amazing feat to undertake and is a very natural looking result also.
Ed Trout’s “Willow Leaf Ficus”
That is an amazing tree!