The kits have so many beds strewn about the house, yet they seem to each have their favorites. It varies seasonally, too. The knit wool one is a favorite of all during cool weather. The beds in general are less popular during hot weather or when the heat's on. They love roasting themselves on the radiator covers during winter.
This picture is of Dolly and Lizzie in their respective beds, or "boo boo beds", as they've come to be known. Nothing to do with boo boos/injuries; it's just a term the doctor used once and it stuck. I think they also like that these beds offer a bit more privacy, seeing as they're tucked onto the coffee table's bottom shelf.