Make a new image that's 400x400 and make sure the background colour and the canvas is white. Excellent. This tutorial will show you how to create a really basic moon that not only looks pretty but actually looks like the moon. It's so easy, which is why you should try it out. First of all, create a new layer.
Select the 'Elliptical Marquee Tool' from the tool menu and hold down Shift and create a circle in the dead center of your canvas. This can be done by hiding the bottom layer and using the small squares as your guide. When you've got your selection, it should look a little something like this:
When you've got your circle selection, feather it by about five. Any higher and it loses its realism. When it's feathered, press D to reset your colours. Make sure white is your background colour and black is your foreground colour. Go to 'Select' and press 'Invert' to swap the selection around, like so:
Then go to 'Filter - Render - Clouds' to fill the feathered selection with clouds. Press CTRL+D to de-select. You should then have something like this:
First of all these clouds look too bright to be night time, don't they? We can soon change all that. Go to 'Image' then 'Adjustments' then 'Brightness Contrast'. Enter '-50' for Brightness and '-50' for Contrast. Click ok, and your clouds should look much darker, especially more lifelike.
Now click your bottom layer and you'll see that familiar white background again. Press D and go to 'Filter - Render - Clouds' once more. Do this until you're happy with it. If you want, you could even change the brightness and contrast to make it even brighter... it's your choice. But that's the end of the tutorial! If you've got knowledge of image ready, you could even try making it animated... it's worth a go! Here's my final result:
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