In a children's room, it just makes sense to store books facing flat. Then children can put their own books away. Also, flat bookshelves take up less floor space, a bonus for often tiny secondary bedrooms. Special thanks to Matt, Heather and many other readers for sharing their photos.
1 – 12′ 1×6 Board (cut sides out of this board)
2 – 1×6 @ 57″ (Sides, Top Cut out in step 1)
Finishing. Fill any holes with wood filler and sand and finish as desired. Screw through the back supports into a stud in the wall to keep the bookrack in place. You could alternatively use a picture hanging kit to fasten the bookrack to the wall.