All buttercream except hat and diploma on top. I used a 1/2 sheet on bottom, and a 1/4 sheet on top. Frosted cakes in beige BC. Then used wide icing tip on zig-zag edge side of tip for 3 sides of each cake representing pages of the books.
Used #5 or #6 edge piping around books. #4 tip for title of books on sides.
Police tape was #150 and #3 tip writing.
Top edge of book for message was yellow and black BC #4 tip.