Created the Pot in 3D Studio Max. It is a lathed spline with Mental Ray texture applied.
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Rendered in Max
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In Photoshop masking my pot.
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The "rainbow" is a gradient filled shape.2 layers of shape set at Multiply layer blend mode. One of the layers has an outer glow effect. I smudged on the edges of the rainbow some and masked out some of the outer glow. Shading and shadowing done with gradients and brush. Layer masking used to extract/blend the Leprechaun , the gold and the pot.