The reason why i bring this up is because of the confusion of what you can have or what you cant have as a decoration.
Therefor I suggest addeding somewhere to where you can "apply" in a way to have lava placed in certain area's
For example I really wanted to have lava placed as decoration for my Evil Kitty Chamber of Adorableness. Then i would post a screenshot of the area which i would like some lava placed (In moderation) And see if it gets denied of placement or Approved of placement.
Ex:
{FAKE IMAGUR LINK}
{coords for where it is needed to be placed}
Reason Why you would like to have the item placed there:
Using this system it would clear up confusion and give oppertunities to have more Decorational Blocks in the game that are now banned, Like Tnt minecarts perhaps.
Thank you for reading I would more than happly take feedback on this