Inspiration: the Time Travel series by Flora Borsi.

You will use the following tools- and maybe more:
-layer masking
-desaturation (convert to black and white)
-selection tools (quick selection, select subject, magnetic lasso)
-layers
Your mission is to use Photoshop to create a time travel scene that tricks the eye by blending in at least four objects from a different time period. TWO of these objects should use the layer mask tool so they are layered behind another object. Like Ironman is behind Lincoln in our example.
BIG HINT: use a black and white photo for your starter image to make matching brightness and contrast MUCH easier.
Turn in your final composition as a jpeg file. Click here to learn how to save as a jpg using Photoshop.

Follow these thrilling tutorials that break down the different parts of this composition:
Video: Photoshop Time Travel Full Tutorial
Video: Masking an object (like the Rockstar can above)
Video: Masking One Object Inside of Another
Video: Blurring a Masked Object
Your composition should have at least four related objects that don’t fit the time frame of the original photo. Look at the image above to find the Xbox, Xbox controller, Rockstar health beverage and Xbox error screen.