Actually, it is quite easy but requires some testing. A) Take your original design, photo or whatever into Photoshop, and duplicate as a new layer. B) Edit > Transform > Perspective. Add a perspective to counter the normal perspective. The amount of this depends on the angle and distance where you will be seeing the image. C) Squeeze a bit your image. In my example is 66%.  D) You can take some scissors and cut your shape. Depending on the quality of the image and how well it is lited this will blend better on the surroundings.