Sometimes everyday colours can be a bit bland.
I often use custom white balance setting in my Digital Rebel to create vivid in-camera effects. The tip is to choose a photo already on the card that is relatively lacking in detail but that imparts a hue to the new photos. Experimentation is essential, as I have not worked out a system that can predict what colour tones are the final result.
It's noteworthy that taking a shot of the black plastic in a car and using that dull photo can increase the richness of reds. A scientist would be able to explain why this is so.
It adds to the excitement, particularly on a dull, overcast day.