If you want more Gyriosds for you're house here is a coo, way to do it.
All you need to do is change the date to be like 10 years in the future, and then come back to town and Gyroids should be buried all over the place.
Note: If you ever do this you should always plant trees that you want to grow fast before you go into the future, because they will grow instantly! Cool huh? Oh and you can't forget there is one thing i should warn you about before you do this. When you ten years into the future it acts like you just didn't play for that long so not only will you get TONS or Cockroaches in you're house but weeds will grow EVERYWHERE.