Create a new document 1200x1200 in Adobe Photoshop. I will create 1200/1200 300 dpi RGB document, but you may to use a different size.
Go to Filter> Render> Clouds, then apply Filter>Render>Different Clouds and Filter>Blur>Motion Blur.
Make selection of yellow rectangular, then invert selection and press Del.
Copy yellow rectangular and change the Blending Mode to overlay.
In new layer create elliptical selection, fill it and add volume with layer style
Good luck!

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