I love the black and red bookcases
I was perusing interior design images a few days ago and noticed that the most impressive home libraries didn't shy away from color.  Even in houses where the rest of the interior was prominently white, the studies were surprisingly rich in deep colors, perhaps because of the coziness and regal feeling that rich colorful rooms provide.  In this case no better place for those characteristics to exist than in a home library.  Enjoy!

Kelly Wearstler design. 

Photo via Vogue Magazine

Photo by William Abranowicz.  Design by Aparicio Associates.  via AD

Photo by Mikkel Vang.  Design by Kelly Wearstler