Rainbow Bookcase

I did it!  I saw a bookcase on Pinterest that was set up in color (not alpha) and I loved it - it looked so different and fun.  So, I tried it.  I purged some books along the way also: moved my cookbooks to a kitchen cabinet, found some books that can be placed in the yard sale box, etc.  But I love the finished look.  I do have way too many blue books so they are spilling out a bit, so the photo albums below might need to find a new storage space soon. 

Do you sort your library alpha by title, author, category, color, or are they just all over the place?