snapchat-poster INSTANT PARTY HIT! DIY - Purchase a foam board or use cardboard. Size is 24″x36″. Cut out the center of the poster. Put a very small amount of glue, (glue stick works good) to the back of the poster. Attach the poster to foam board or cardboard. Let dry thoroughly. Using a straight edge and a craft knife or utility knife CAREFULLY cut out the center of the board.