[*]Open a new picture. Size and color of the Background layer don't really matter.
For this example I chose 300 x 300 px transparent.
Open a new layer. transparent.
Choose Filters - Render - Clouds - Solid Noise
Detail = 2, X = 4 Y = 2
[*]Next use Filters - Distorts - Waves
Amplitude = 10, Phase = 0 Wavelength = 33
[*]To give it the metal shine, open Layer - Colors - Curves
The more curves you make, the more shine
Example with 3 curves
Example with 5 curves
[*]At the End you just add some color.
For this you open Layer - Colors - Colorize
Finished !

There are many ways of getting to this metallic shine. I've made some more examples for you.
Whirl and Pinch

IWarp

mosaic

Have fun !

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