Well First off this is just a simple Tutorial on how to make a Realistic Clouds Background
First off you'll need Adobe Photo Shop, After getting that you'll need a Brain, a pair of hands, and a few Basic Photo Shop Skills!
I Created this when I first Started using Photo Shop So this shouldn't be an issue.

okay First step :

Open a new RGB Background with Transparency.



Make the Settings look like this



Then Press The Hot key 'd' To restore the default background and foreground colors(Black and White)

Using the Rectangular Marquee Tool Select the entire background and right click then click fill Fill with the the Foreground color



Next On the Color Palette, set the Background color as #3E6CAA and the Foreground color as #76B6F4.

Then Right-click the background layer on the Layer Palette and choose Blending Options.
Apply a Gradient overlay using the settings below



Create a new layer and Press D to reset the Color Palette.

Render the Clouds by doing Next, render Difference Clouds Do this Three Time. Do this by using the top menu to execute the Difference Clouds filter once, then pressing the Ctrl-F hot key 2 times to repeat the last filter (in this case Difference Clouds) twice.
It will then look like this


Now Adjust the color Levels

Adjust "Input Levels" to approximately: 29, .056, 77 or until it looks like the image below
<levels>
First Select all, then Press Copy, Click the eye icon to the left of your cloud creation layer and hide it. Create a new layer, Enter quickmask mode by pressing the "q" key, Then Paste.


Exit quickmask mode by pressing the "q" key. Press 'd' to reset the colors, Fill the selection with the background color.


Deselect the selection. Hot key is CTRL+D. Now do Set "Size" to approximately 50 px


Now Set Contour to the Gaussian curve.

[quote]If the options shown in the Bevel and Emboss window are not shown in the screenshot, tick the contour sunoption and click on the dropdown in the Countour window and choose the sixth option.

Create a new layer and then do

and then Repeat Difference Clouds 10 to 20 times until you have a complex pattern.


Now Enter quickmask mode by pressing the "q" key. Paste. (The clipboard should still contain the clouds layer contents (Cloud Texture).)


Exit quickmask mode by pressing the "q" key.
Copy.
Deselect the selection. (command-d)
Click the eye icon to the left of your cloud texture creation layer (Layer 4) to hide it.
Create a new layer. (Layer 5)
Paste.

menu: Filter -> Stylize -> Emboss

1. Set the "Height" to around 50 pixels.


Now do
and Set "Output Levels" to approximately: 218, 255



Go back to your clouds layer (Layer 3) and "Create Layers" from the Bevel & Emboss effect



Now Delete the screen layer (white streaks), leaving the multiply layer.
and then Select the multiply layer (black streaks) and:
do
Set "Radius" to around 16 pixels.
Adjust the multiply layer's "Fill" to around 50%


Thats it