For this tutorial you are going to need:

20/20
Xenoflex

This is the image I am going to use for this wonderful background.



Again, you can use this one, or one of your choice......

Open this image in PSP.

Now go to Effects, Plugin Filters, Xenoflex 1.0, Shower Door
and use the following settings:



This should be the result:



If you are going to use this as a background, you want it seamless...so, let's
try to achieve that.....

Save this image and open it in 20/20.

In 20/20 go to Image, Tile Effect. (I have version 2.2.5. In newer versions this
could be a bit different, I am not sure).

Now we are going to check if this image is seamless. Again in 20/20 go to
Image, Tile Preview.

If everything went according to plan, you should have a seamless background.