Books by Color

I've always organized my books by the author's last name -- I'm sort of like a library that way. 

But lately, I've been seeing all these pictures of books organized by color.  I'm digging the way it looks -- sort of like little pops of color for your shelves. 

I've got six boxes of nothing but books packed already.  Surely I could get some sort of color scheme going.  Surely.

Here are some of my favorites from my Google search for "color organized bookshelves:"