We started with a 10 foot piece of white plastic gutter and 9 brackets from our local Home Depot. B cut the gutter into two 4' pieces and one 2' piece. The 4' pieces just fit best on the wall we wanted to use. We had C stand against the wall to determine the best placement, and then put the remaining 2' in our bathroom.
We spent about $20 for materials, and it took B about 30 minutes to complete the project -- including cutting and attaching to the wall.This picture is 3 years old, but I've talked about these shelves no less than 5 times this week -- so I thought I'd post here as well! Hopefully it will help more people. While we don't have many board books out any more, these shelves still work well for books the boys are interested in now.