Wells, should the interior of your house receive high marks from the Housing Committee (or whatever it's called), I believe there are some special items that they gift you. The hard part is finding the right formula (that is, besides using a complete themed set of furniture), when your house eventually expands in rooms & floors.
I'd say it wouldn't hurt giving Feng Shui a try. I tried it out in Wild World and I seemed to have really good luck. So either it was the Feng Shui or a coincidence!