Start a new document 600x600 with white background. Reset your colors to black and white

Create a new layer, then go to filter » render » clouds

Now duplicate this clouds layer twice, hence giving you 3 same clouds layer.

Select the "Layer 1 copy 2", then go to Edit » Transform » Flip Horizontal. Set this layer's blending mode to "lighten".

Select the "Layer 1 copy", then go to Edit » Transform » Flip Vertical. Set this layer's blending mode to "Lighten"

Then go to Layer » flatten Image.

Now go to Filter » Sharpen » Unsharp Mask
Amount: 500%
Radius: 2
Threshold:0

Then go to Filter » Sharpen » Sharpen. Press CTRL+F to reapply.

Apply the following Lighting Effect:
CLICK TO VIEW
The color used is: #C5940B