Feeling blue. In 1901, influenced by the suicide of a good friend, Picasso started his Blue Period, in which he almost always used blue palettes in his work. These pieces were rather austere and cool, and were unpopular with the general public.While blue is often cited as a cold and even depressing color, tones with a hint of red feel warmer. Unlike cool blues, warm blues advance toward you, making them a cozy choice for a social space such as a living room. The accent wall in this room feels anything but cold and aloof, despite the concrete, marble and gray.