Make a pattered image like a brick wall look like text is popping out of it.
Instead of popping out, you can make the text look like it's going inside the wall by by making the shadow thicker on top than on bottom.
Perspective Clone Tool will allow you to clone part of an image into the foreground or background. It does this by scaling the area at the same time that you are cloning it.
Add text to a photo in a way that makes it look like it's behind other objects in the scenery.
A demonstration of creating a color wheel diagram, first of cyan, magenta, and yellow- then again of blue, red, and green.
Scroll down to the section "Flip An Image"
on this webpage:
<Image> Tools > Transform Tools > Flip