Imperfection soothes the soul, and so does nature. Incorporating natural materials, textures in forms that will age well and acquire character with use, go far in creating cozy rooms. Natural light and visual access to outdoors help, too, as seen in this eat-in kitchen. Those elements also help create timeless spaces which I always prefer over investing in trends that will soon seem dated.
sources: image 1, images 2,3,4, image 5