I'd put imitators in something like this. I'm just looking at options for desktop terrariums. At least with a globe I can have 16" diameter at some point. I haven't had any luck finding that in a cylinder yet.
While I've been focused on a globe or cylinder that you only view from one side (I still have a waterfall stuck in my head), I can't help but agree that something that you can view from all directions would be amazing. But I'd want something small enough to fit on a desk and big enough for two imitators to enjoy. While I'd love it to be centered around a truck with broms growing on it, but I haven't researched enough on how to do this. The 10" diameter is too small, but I see the potential in a style like this when I look at pictures like these:
A start in the right direction. With a 16" diameter globe, the bottom and center might be wide enough for a few broms. Maybe.
Justin