I never thought I'd be saying this about a tomb, but these are quite beautiful! And I agree with you about needing a more sustainable option than traditional burial. This could be a great option, if people in the US would embrace it. I think green burials are also becoming a little more popular, but many people still don't like the idea of their bodies decomposing naturally (it doesn't bother me personally - actually I prefer the idea of it - but I know other people who wouldn't want that for their burial).