Yup, I found it on youtube. a pond with DOMESTICATED male and female Bettas living in a pond, naturally breeding, etc!
Heres the link: http://www.youtube.com/watch?v=1M0joJ0vTV8
IMO that would be really hard to manage with rain and predators, etc. But with that many Bettas I guess you never really notice if you lose a few... I think it would be AWESOME to have a Betta pont like this indoors!!
Another Betta pond (I think!) This one is almost all males, or so it appears.
I could probably make an indoor pond if I got a thousand gallon tank! Imagine trying to condition that 0.0 It'd take up a lot of room because a tall one would be waay to tall! Though, that would be cool haveing a 1000 gallon tank with 500 Bettas... You could keep males together!