Maybe use it as an invert tank? Some live plants and a colony of cherry shrimp would be be nice. It doesn't really have much of a footprint, I'm not sure I'd even recommend a betta for it.
I agree with the inverts. The problem with a container like this is the amount of surface area for the volume of water. All your gas exchange, O in and CO2 out, takes place at the surface so keeping fish, I think, would be difficult at best. It does look cool though.