FOSS gamedev and creative worlds

I have a proposal. Usually you don't want to ruin a map so the map meta doesn't change but when you want to see interesting structures for example I switch it. Now the only rule is either post the map or take a screenshot. WARNING DO THIS ON NEW WORLDS NEVER ON OLD UNLESS YOU COPY

This is not that exactly, but done by loading an old 0.3.x world into 0.4.6:

EDIT:
Another one: