Blue paint can make a room feel ethereal, like it’s floating among the clouds. But some blues feel more “baby announcement” than “grown-up retreat.”When Lindsey Mahoney of Building Bluebird moved into her home a year and a half ago, her bedroom had her feeling the blues. The baby blue walls were washed-out and meh, and they certainly weren’t helped by the original blue 1969-era carpets — one of the first things in the home to go.