Eggplant purple and green are the accent colors all through my house which is mainly yellow hued beiges and tans and white. I use touchs of purple at Christmas too with red, green, & gold. There's also new opinions on dogs seeing some colors in varying hues. Red is supposed to be one of those colors I think. Since purple has red in it; if these theories are true it would explain Heidi's preference. I choose to believe it's because she has exceptional taste!