Well this is my first topic so here it goes. My idea's are usually really ambitious and the idea I'm putting forth probably could only be done by a amazingly skilled individual or a large group of age builders who have had experience. Unfortunately my fledgling skills at modeling and scripting on blender have relegated me to the enjoyable position of artist .
My idea would be a new island in the D'ni cavern. The island would be home to the ruins of a mansion by a Master J'narai. The entire mansion would have an assortment of physical and mental puzzles and over time, it could be home to fan-made ages. The island would have only been recently examined by the DRC before they pulled out of the cavern so the entire island would've been left untouched since the fall. To add a great depth of realism and history, meals fossilized by the lack of organism in the air (the gas Veovis and A'gaeris unleashed could've killed them), D'ni journals and equipment left behind by the DRC and in the homage to Pompeii, the remains of those who were on the island during the Fall, frozen in the position they died in (like the people of Pompeii. It would be a very haunting place to visit, a part of D'ni left untouched by the DRC and Atrus' excavations of the Cavern in BOD.
I'll post more images when I do them but for now, this is the only image I've done. If you like the idea, I'll post more ideas on how this can be done.