Alex Krasny from Agree or Die has provided us with multiple lovely tutorials on how to make creative and unique ties. They are great for mixing up a classic look and will help you break away from the monotonous routine.
You certainly won't find these ties on an accountant -- these are the kinds of tie knots you would find on those outgoing advertising types and magicians. They are definitely for those who are right brained.
Three styles that stand out are the Trinity, the Eldredge and the Cape. My favorite tie style is the Trinity, especially because it is suiting of its name with three distinct viewable folds. It also possesses a futuristic look unlike anything I've ever seen. These tutorials should give you enough knots for every day of the week.