Using scissors, cut the back and bottom off each box.
Adhere the masking tape/duct tape to any edges and closings that need a little extra reinforcement.
Using a pencil, trace an elongated half circle at the top of the box to create the neck hole; cut out with scissors.
Trace an oval on both sides of the box to create the arm holes; cut out with scissors.
Carefully adhere tape to the cutout rims of the neck and arm holes (to prevent chafing and irritation from the box).
Space the boxes far apart from each other in your yard, or other work surface, face down; spray paint the inside edges and internal rims of the neck and arm holes.
While the inside is drying, cut the red solo cups; leaving about 3 inches of the bottom. You will need 6 cup bottoms per box.
While your hot glue gun is heating up, take your pencil and mark off 6 dots on the front of each box (2 rows of 3; evenly spaced).
Apply hot glue to one rim (cut side) and carefully (but quickly) press down onto one of the markings on the front side of the box; continue with the other 5 cup ends until you have created the LEGO studs. Repeat this process with the other 3 boxes.
Apply hot glue around the base of each cup end; on every box, to create a sturdy seal between the cups and boxes.
Space the boxes far apart again in the yard; face up. Put your face mask and gloves on.
Spray paint each box and studs with any paint color of your choosing.
Allow to dry in the sun for 1 hour.
Let's get SPOOKY!