While I was using Meditation in my house, I thought that it would be fun if I had a yoga mat or a Newton's cradle or something like that that would let me meditate for longer, or give me a bonus to my energy and or mood. Then I thought that that concept could be broadened to include other skills to make them either work faster, be more productive, or use less energy. I also worried about whether this would unbalance things, and how that could be mitigated, and I came up with the idea of making rooms for houses. Rooms would take up a specific set of space, and only allow specific furniture in it. The Prereqs should be high, including Furniture Making 2, and maybe Potion Making 3. They should be at least 4 wall-segments wide.
Teleportation Pad - Teleports cost half energy.
Meditation Studio - Meditations reap 50% more energy and/or mood.
Kitchen - Drinkmaking, and cooking skills take half the time to complete.
Laboratory - Alchemy skills use 10% fewer elements, and take 20% less energy to make.
Shop - Industrial skills use 20% less energy, and machines take 20% less time to finish.
Refinery - Smelting and Grinding take 50% less energy.