I don’t think this particular idea is still going, but of course everyone can still make their palaces and share them on the forum! 
If you want some inspiration, here are some of my topics:
GTAV: Artificial Memory Palaces series - GTA:V
Fallout 4: Artificial Memory Palaces series - Fallout 4
And here is a link to my website, where I host the finished tours of a part of my virtual palaces.
Our great wiki also has a huge list of sources for virtual memory palaces, if you are looking for even more inspiration! The wiki can be seen as a plain version of the posted idea, at least as being a source for virtual palaces.
And last but not least, of you search “Virtual palace” on the forum, you can get a lot of topics devoted to them