I think the appearance of Blorb Mushrooms are pinkish. The reason why I think of this is because in Mario & Luigi: Partners in Time when Bowser meets the mysterious seller (Fawful), you can see his shop/stand has a Vacuum Mushroom in the middle with Pink Mushrooms orbiting it which could be...
Well, it'd be nice if there were a 4th game of the Mario & Luigi series. This topic is for what could be included into the 4th episode such as Bowser being a playable character or having Fawful return.