Anyone else like building habitats?

I noticed two of our new Ts like to burrow, the first two never come down from the top, they all have enclosures but I got bored, picked up a new terrarium and looked through a massive amount of cork and found a great piece, cut it down one side and trimmed some off the bottom - a tunnel with two openings (you can see all of the tunnel from the side), and decorated a bit. I mix coconut substrate with reptile bark, about 75/25. To combat the air situation, I ordered some LED computer fans, USB adapters with variable speed controls (they're not here yet), but I plan on setting one on top on the lowest speed it goes (moves some air but not much), to keep air moving, I'll have to add pictures to this after I add the fan (LED lights on the fan, and whatever color you set it to). Anyone else have setups with anything like that, or just like making different habitats for fun?