To begin with I thought it would be easy if I just did one vertical one horizontal, but actually this didn't work. My first couple of attempts made me realise I needed to think differently when shooting in this style. I finally found that by taking an area an just walking around seeing the scene in the format I intended to shoot in gave much better result. I didn't take the same picture in both formats as in my first attempts but viewed the area (a small park) looking for the pictures that would suit the format.
For me this was very liberating and I started seeing more shapes and lines once I took this approach.
The first few vertical frames I looked for tall objects, the trees, the statues and buildings. Then I saw lines and patterns, shapes that benefited from a vertical composition.
When I shot the horizontal images I was more aware of shapes, patterns and balance for this format as a result of concentrating solely on vertical images for the first part of this exercise.
This is a technique I will employ in the future when I'm looking to make my images more interesting. It is a great way to see more than your initial view. Different ways to balance an image and taking your time to see everything.