Silk Screen (Andy Warhol Style)
Andy Warhol used a process called photo silkscreen, transfering an image to film, then the film was burned onto a screen using a strong light. Some of his famous portraits include: Marilyn Monroe, The Can of Soup and Ernesto Che Guevara.

For more on Andy Warhol you can visit the Andy Warhol Museum.

1. Extract the subject from the background (You can skip this step if the background is pure white).

2. Go to >Image>Adjustments>Threshold and move the slider until you get a good looking image.

3. Duplicate this layer and Fill with white.

4. Go back to the black and white layer and remove the white. >Select>Color Range... Select the White, hit OK.. then Delete.

5 . Create a new layer and fill it with a color.

You should have three layers at this point. and you'll be able to modify the color of each "screen". I prefer to use the Color Overlay Layer Filter, but any technique should work.

6 . Make multiple versions and place on your layout. (this color scheme is based on the "Che Guevara" Painting)

Click Here to download a PSD that will show you the 3 Layers used for this trick.

For a more colorfull version you can use Cutout Filter (>Filter>Artistic>Cutout)