A silhouette puts the ’graphic’ into ‘photographic’, reducing your subject to a featureless dark shape against a brighter background. There’s no better time to hone your silhouette shooting skills than right now, when the sun is low in the sky for much of the day and both dawn and dusk are at a reasonable hour.
However, don’t limit yourself to the colours at the ends of the day – a black & white silhouette can be just as striking, and ripe for a contrast-boosting lith effect.
There are only two things to remember for successful silhouettes: expose for the background, not the subject (your camera’s spot meter is good for this), and try to avoid having too many overlapping objects in the frame.
Keeping things simple is the best option.