Look up spanish moss. Many of the cypress tress and oak trees down here have LOADS of spanish moss. The contrast of its color is what makes the cypress/oak trees uniquely awesome to stare at because their trunks are roughly the same stale looking, brown color, as the moss. It doesn't grow down here in South Florida as much as it does in middle/central florida where its more dry, but it's still common to the floridian eye no matter where you live. The cool thing with moss is, it won't kill a tree, like your ficus tree, but youll need even MORE sun on the ficus because spanish moss, or any moss rather, will absorb the sunlight if ur not controlling where the moss is growing. You obviously do not want the moss to cover the top or side of the ficus where its getting sunlight. You'll want to trim/pull/take out moss thats affecting main areas where the tree is getting sunlight ok?
Spanish moss is generally super dry, so its easy to pull off/take out/ and easy to manage. However.. once you start growing it theres no stopping it lol
I've seen people grow it and within a year, its COMPLETELY engulfed the tree and it hangs down by the feet. As kids we would pull it off trees and use it to start fires because its naturally very dry. Im not sure as to its water intake.. but naturally you would spray mist on the moss, and pour water in the pot for the actual tree.
Google spanish moss, youll see what it looks like. I've seen it grow on a handful of ficuses down here when maintained. Otherwise, it will die on a ficus because the way the leaves are, they cover alot of surface area and grow OUT, Not permitting sunlight to hit the moss, which is why itll grow easily on cypress and oak trees because the leaves on them are smaller than my finger nails.
*Note- you dont have to pull up the moss to replant. The moss im talking about grows on the tree, not under. Im not talking about the green moss that you see growing in dirt, this moss specifically grows on branches of trees and usually droop down to get more sunlight.
Heres a picture of spanish moss thats slightly thriving on a cypress tree.
This is a green version of spanish moss, and usually what I'll see when people personally grow it on their trees for asthetics, on trees neither oak nor cypress nor maple. Green moss might actually look pretty awesome on ur ficus Tree, if you can control it to hang down from the middle/bottom branches of the upper area of ur tree. If you dont spray or let it dry out, itll get that light brownish color, like im acustomed too.