Stretch or crop your picture to create a false panorama.
Its easy to crop the top and bottom off a photo and then print it out on A4 paper to create a 4x10inch print - just like those youd take with an APS camera. Wasted sky in a landscape is a prime target for removal.
In this example the foreground sea and large area of sky do nothing to help the photo. By using the crop tool we lose all the area that shows here in grey and end up with a far more professional looking image.