Golden Pothos and a small philodendron can be potted individually. Would look very nice setting under the taller one.

Peace Lily is an excellent stand alone choice. A nice eye catcher while flower.

Ankrara's Hobby Corner

One of the scented pelagorniums would be pretty edging under the yucca. Some trail nicely, too. I have one that smells just like lime when you rub the leaves. It has crinkly serrated-edged foliage and it likes bright light.

They come in scents of various citrus, other fruits like apple, rose, and even nutmeg. They flower, too, but that's definitely not the main show.