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The Layer Style Stroke (Gradient, Shape Burst) might also be an option,
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You can use the gradient tool and create a clipping mask. Use the foreground to transparent gradient so you can selectively apply a gradient to each section. Do this in a seperate layer and then clip the layer to the palm tree layer.
 
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The Layer Style Stroke (Gradient, Shape Burst) might also be an option,
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I was thinking Inner Glow would be similar, but it has trouble with sharp corners.
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Good one!
I quess it depends on what appearance the original poster is aiming for.