The one thing that is often overlooked in print design is paper. Not necessarily the type of paper – you probably are well aware that there are countless options to choose from – but rather, how the paper is folded, how the color of the paper interacts with the overall design and how different paper colors can be used together in the same piece (for very little additional cost) to create a more dramatic impact.
This is especially effective for one-color jobs, but it also works for full color. A layering of paper types (heavy cover stock, medium text weight and light translucent papers) make for a richer, deeper design without much additional expense.