Following yesterday's feedback I decided to persist with the map theme. And found both modern Michelin maps and this 1940's OS map had some very nice colours to offer.
In line with the suggestion I have gone for colour, and slightly upped the contrast which has had a pleasing effect.
I think I might be exploring this more in the future, I've always had a fascination with maps, so after randomly sticking a pin in one yesterday, a whole mini project may have been born!
- Canon EOS 500D