Shakespearian Bookends (Hamlet and Macbeth)

I made bookends in the style of Shakespeare's best known works.  Want a knife to the back, try Macbeth.  Want to brood?  Try Hamlet.  Put them both together for ultimate angst. A great gift for English teachers.  

Warning, with the set infill these aren't heavy enough to hold back more than a few paperbacks.  I welcome fixes/advice to make them heavier.