Biotope might be what you were thinking?
Im not sure i would put balas in, they get pretty darn large and may snack on smaller fish.
Asian themed tanks are quite easy to pull off- a mixture of glass cats, harlequins, loaches of some sort and dwarf gouramis always looks nice and usually peaceful aswell :lol:
South american themed tanks can also be quite nice. Rams, rummies or cardinals etc, cories, angels, various plecs and so on.