TheNamlessGuy said:
Oh, yes, I vote for this one!
Or you could go for something iconic. Someone mentioned a beholder, which is always a good choice. It's also round.
Another option would be to choose something from your favorite setting? Eberron, Dragonlance, Forgotten Realms, Greyhawk, Ravenloft, Golaron (Pathfinder setting), etc all have notable characters and creatures that could provide a theme for your cake.
Still, I gotta say, that book cake is amazing.
OP: Just one question - your bride is okay with this, right?