For me, this small front garden using just two plants has me thinking about a scene in nature. Here in California it could be a grassy meadow with an oak tree (see the photo below.) So when I saw this, my associative mind was excited by the representation. But I was also excited by the 2-plant choices.
The nice thing about Billbergia is that is it an extremely tough plant. It makes an excellent container plant, which you can grow as a house plant, OR, outdoors if you live in a mild climate.