Tired of using the same old clouds (FILTER...Render...Clouds) which rely on the Foreground/Background colors? Here's how to get some variation...
This is a fabulous tutorial which will introduce you to many new techniques, Actions etc etc.
Open a new image (FILE…New) 400 pixels x 400 pixels, 72 dpi, White Background.
Create a new layer (Layer 2).
Change the Foreground/Background colours to a dark blue/light blue.
Select the Linear Gradient Tool and, with Shift pressed down, drag a vertical gradient from the top of the image to the bottom (dark blue at the top, fading to light blue at the bottom).
Create a new layer (Layer 3). Press D on the keyboard to return the Foreground/Background colours to their default of Black/White.
IMAGE…Adjust…Auto Levels to increase the contrast of the clouds.