Here is another technique to make Dynamic backgrounds.

1. Create a new file with following settings:

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2. Fill the layer with #213242 color.

3. While using Pen Tool, draw the shape like following:

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4. Right click on it and select Make Selection, give 0 in Feather and hit ok:

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5. Create new layer and by using Gradient Tool, draw the gradient from White to Transparent like shown below:

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6. Select Background layer and create a new layer, now pick Gradient Tool again and draw a Radial Gradient like shown below:

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7. Set the Blending mode of this layer to Overlay and set the Opacity to 50%.

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8. Select the layer on which you just made Curved Gradient, press Ctrl+J to duplicate the layer and rotate this layer and change the size, so repeat this action as many time as you like to make the shape something like shown below:

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9. Chose Brush tool and sets its brush settings to as follows:

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10. Create new layer and now pick Pen Tool and draw the shape like shown below (don’t join the first and last points):

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11. Right click on it and select Stroke Path and give the following settings:

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12. Now press Ctrl+J to copy this layer and by pressing Ctrl+T adjust it with the previous shapes, now repeat this action untill you have atleast one line on each of the previous Gradients layer, like:

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13. Merge all these lines and while using Eraser Tool and selecting its Blending Mode to Color Dodge from Layer panel and reducing the opacity a little bit, use this brush to make the following shape

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14. Pick Brush Tool and bring White color in Foreground in Color palette and brush over the lines to face them down, change the blending option to Overlay in layer panel:

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15. Now merge all the layers and run the command Layer >> Layer Styles >> Inner Shadow and give the following settings:

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Here is the final result:

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