Adobe Photoshop Tutorials
Open a new RGB document (I made it 300*300px) and set the back and foreground colors to something like this:
Let's start creating the dune.
Select the gradient tool and create a gradient like this:
Go to Filter --> Distort --> Wave and play around with settings similar to those in the picture below until you are satisfied with the outcome.
This is what you might get:
The next filter you have to apply is Filter --> Distort --> Shear
Drag the dots until you get a line that looks similar to this:
You're almost done..
Create a new layer, fill it with white and apply Filter --> Noise --> Add Noise with these settings:
Set Blend Mode of this layer to Lighten and set Opacity to 10%
That's it, there's your sand dune!