If I'm going to play with ice that way, I really want to avoid the cloudiness from the dissolved air as it freezes. I suppose I could freeze and then thaw the water first, to try to get a clear ice, but I'm sure there's something clever for when the pros do it.
The picture looks like they cast some clear resin in a mold for the photo. Real ice could be made to look that good, but it'd be much harder to shoot. Given who they're marketing to, I think they should have taken the time to at least make it look realistic.