The following are links to Stereo 3-D images. If you look at them in the right way you should see hidden 3-D images in them. Try this method to see the images:
Download the image to your computer and center it as your background for you desktop (make the rest of the desktop black - this helps). Or try it on my webpage (its up to you).
Try to find a reflection in the image (like the reflection of your face or a white shirt or object).
Focus on this relflection for about 15 to 25 seconds.
Now focus on the image. If done right you should see a hidden 3-D image.