Java fern is a great start! A lot will depend on your lighting though as to what plants you can have. Taller tanks need stronger lights because the light has to penetrate further. However, there are some plants that will grow (albeit slowly) in even the weakest light. Try checking other types of Java fern (windelov, narrow leaf, Philippine), anubias (also lots of different types of leaf shapes/sizes), and java moss. These plants all can just be tied to driftwood/decor and they'll eventually just root to it. There might be some other plants you can do depending on your lighting but the ones I mentioned are pretty indestructible. Try googling stuff like "narrow leaf java fern tank" or "anubias aquascape" for some inspiration. You can have a beautiful planted lowlight tank with little difficulty and your fish will surely appreciate it.
I just got a nice piece of driftwood in my other tank and I can tell that the fish like it more than the plastic stuff I had in there before. Thank you for all the help, and the ideas.