Do you use them? What's your favorite kind? I currently have the 3 different Dekkoids in my main room. I like them because they're colors fit well with the feng shui I have going on. Plus, they actually sound quite nice together. 
I never use gyroids, and when I dig one up, I head to Re-Tail and sell them. However, the only gyroids I've ever kept and placed in my house are the gyroids Brewster gives you because they just look so cool and their sound effect is awesome for the cafe in my house.