3D anaglyph glasses. 2D in 3D conversion : The anaglyph method uses color to encode the  right and left image pairs. This method requires that the user wear a special pair of glasses with color filters over each eye. These glasses have a red filter over one eye and a blue or green filter over the other eye.  Most anaglyph glasses put the red filter over your left eye. Best view with blue than green on this site.  To make a pair of Red-Blue glasses for viewing 3D photographic images, you will need red and blue transparency material. This can be purchased at hobby stores . To make frames for the glasses, cut a piece of thin cardboard to the shape you desire.  

Stereograms are pictures with a hidden image in it. There are a few methods to see the hidden images. One is to converse your eyes on a position twice as the picture and than after some practice you will see the magical image before you. For some help you can focus on the 2 spots in the picture. The trick now is to stare through the image until you see three spots instead of two. Good luck