In the following tutorial you
will learn a fairly simple method for creating a realistic looking
folded corner.
1. Open the item you wish to fold the corner of. In this example
we will be using a 12x12 background paper. Duplicate the document
(Image>Duplicate) and close the original, so that you are
working from a copy and not altering the original document.
Double click on the "Background" layer to change it
into an actual layer.
2. From your toolbox select the Polygonal Lasso tool. If it
is not visible, right click on whichever lasso tool is showing
and select the Polygonal Lasso from the menu.

3. Draw a triangular selection around one corner of your paper,
making sure that your third side meets up with your first point.
(Image below shows a zoomed in view of the corner of the paper.)

4. Right-click within your selection and choose "Layer
via Cut". This will place your triangular selection on
it's own layer.

5. Now you want to turn your corner "over". Edit>Transform>Rotate
180 to flip it over. This is the point at which you will need
to get a bit "artistic". Using your Dodge and Burn
tools, located on your tool palette, give your corner some shadows
and highlights, so that it looks like it's actually folded or
curled over. Shade along the outer edges, and highlight through
the center, a bit like this. (The background layer has been
turned off in this image.)

At this point you can add a drop shadow, and further play with
that until you achieve your desired result, also possibly adding
something like a brad to "secure" your corner to your
paper. To use this on a layout, you have a few options, two
of which are shown below. Use your imagination, and have fun
with it!

