I recently discovered a rather nice feature of Photoshop completely by accident.
Whilst you are working on an image, it’s possible to change the colour of the extended canvas around it. This is helpful if you’re interested in viewing your image in context - you can pick a colour that relates to it’s final surroundings in your design.
To acheive this effect, you must do the following:
Voila, now you can see how your image will suit it’s final surroundings.