Sorry for the terrible pics - Iphone, with the sun behind the tank..and a little cloudy after replanting today. But you get the idea.
The first two pics are the tank as I got it (minus spiky orange plant) and the first attempt at making something out of it. It's kind of evolving very slowly...
Container: Meet the .25 gallon 'Betta Arc', complete with funky flashing LED bubble in the floor and obligatory spiky plastic plant.

Of course, its former occupant
died quickly, and thus the tank came to me.

And yeah - IMO this is all it's good for..
Water Volume: I keep calling this a half gallon but it isn't -- it's closer to 0.25 G (is that a quart??) or about 1 L of water. Less, with the substrate.
Plant species: Dwarf baby tears, cryptocoryne, hygrilla, some tiny substrate creepers that hitched in on a ball of moss, riccia (in the very fail moss tree, wow that needs work..), bacopa, peacock moss and a very tiny java fern.
Substrate: Bottom layer is propagating sand mixed with organic soil activator, topped with river sand.
Lighting: Filtered/indirect sunlight, sometimes an LED clamp lamp.
Water Change Schedule: Oh um.. I top it up when necessary. Freshen the water maybe.. once a fortnight.
Decorations: Small pieces of goldvine, some rocks.
Age of Tank: A couple of months? It's been a bit neglected, though..
No occupants, but I'm putting a couple of baby ramshorns in to help keep algae down.