On a dull day, with dreary light grey skies, you can consider doing a few things to add interest.

Off the Apache Trail, East of Phoenix, AZ

Technique:

• Make the background darker by using -1 to -2 stops of exposure compensation
• Get close to a subject that can add interest
• If possible, make that a colourful subject
• Use your flash!
• Set flash compensation appropriately as needed

You will see that even on a dull day you can make interesting images.