This is only the second tutorial I have ever written so I do hope
you can understand it. As with any tutorial..different people have
different ways of using the tools to get the same effects.
Play with it and see what different things you can come up with.

Also..I am no expert in PSP and am always learning new ways of
doing things so if you have any suggestions or ideas , I welcome
them!  *S*
 
 
 

Open a new image..500x500, transparent background.

With your rectangle selection tool..select a large rectangel area
in the center of your image.

Next...use your flood tool to flood fill with pattern of your choice.

I used this pattern.. 

Now ..go to Selections...save to Alpha Channel and save the selection.
We will use it later.

De-select it.  Now, using your rectangle selection tool..select a narrow
area the length of the filled image..

Like this

At this point..I hit ctrl C to copy it

Now..open a new image..500x500, transparent background, and
paste it on it.

Like this.

Keep it selected and go to ..Image...effects...Drop Shadow
I used these settings...
Color = Black
Opacity = 88
Blur = 11.8
Vertical = 2
Horiz. = 2

De-select it.  Now..using your rectangle selection tool again..
select the area shown below..
The object here is to delete everything except the drop shadow to the right,
so be sure you go a little above and below it.

Now hit delete..I just hit my delete key on my keyboard.
You should have just the drop shadow left.
It should now look like this.

Now..use CtrlC to copy it..
go back to your original image that you have filled and
add a new layer..then paste the drop shadow on the new layer.
I use Ctrl E to paste stuff.
This is what you should have now.

You can now close the canvas you used to make the drop shadow on if you want.

Now..just keep pasting the drop shadow. Moving over a little each time.
Be sure and watch the top and bottom so it goes all the way.
It will go over a little but that is ok..we will get rid of that later.
And space them differently..if you space them exactly each time it
will look too perfect ! Remember..drapes seldom crease evenly.
At least they don't at my house..*S*
Now it should look like this

Do not de-select the drop shadow. Now ..go back over it again and paste
another shadow right on top of a few of the ones you just did.
Don't do it on all of them ..just a few of them..to make it look
like they have deeper creases.
Now it should look like this.

See how some of the creases are darker than others?

Next...do not de-select the shadow yet..
With the shadow still selected..go to image..mirror.
This will mirror your shadow..now copy and paste this one on all the creases.
lining it up with the other ones you have done.
Now it should look like this...

Now...de-select the shadow.

Next..use the rectangle selection tool to select the area
along the bottom..where the shadow hangs below the drapes.
Example below..

See how the top edge of the selection is even with the bottom of the drape?

Now hit Delete to clean up the shadow that hangs over there.

Do the same at the top of the drapes also.

At this point it is a good idea to hit Ctrl C then Ctrl V
to make a copy of the shadow layer you just created.
This saves you from having to remake it and you can use it
in making your background drapes.

Now you should have a nice clean set of drapes.  *S*

Now go to Layers...merge visible.

Next...Copy..and paste as new image.

Now you can close the window you have been working in.
 

NEXT