Yeah, it is something interesting, also annoying. That's why we travel to catalog missing items.
When I first heard about the group mechanic, I posted a thread on GameFAQs 7 months ago. The reason why it annoyed me is because I was looking for a lab wall to complete the mad scientist's theme, but all I saw were the neutral wall, Robo wall, cabin wall, green wall, blue wall, ramshackle wall, rose wall, lovely wall, and of course, the wallpaper that should not be sold at Nooks store (common wall). It may be stupid, but in my Idea Blog (a category of blog entries in the StarFall Press), I'm writing solutions about it.