Draw your chosen design in pencil on two large pieces of white oak tag. The design can be simple such an Ace of Spades or more complicated such as a King or Queen of Hearts. A good design should be clearly visible from a few feet away and take up all areas of the oak tag.
Color in the design on the oak tag with markers. Black will show up best against a white background.
Paint a coat of light shellac to the finished design to preserve it. The shellac will help the oak tag mimic the look of real playing cards.
Cut strips of black cardboard out that will fit over your shoulders. The strips should be wide enough so that they fit comfortably.
Attach the strips of cardboard to the two pieces of oak tag. You can use glue, tape or staples.