For my Billiard Ball costume, I took a pattern for a tennis ball. Any pattern for a round object will do. I cut out the pattern in black felt (since magic 8 balls are black). I then traced a round plastic lid onto white felt and cut out.
I printed out an 8 from my computer and with the left over black felt cut out and eight. I sewed the 8 onto the white circle (you can glue on). I sewed the circle onto the back of the costume using invisible thread and a close zigzag stitch.
I then cut a similar circle in the front of the costume. I made a triangle with white foam and printed magic 8 ball sayings (nope, try again, and maybe). I tied and glued invisible string to one of the corners of the triangle. I then used a food saver bag and sealed one end with the string hanging out so it would look as if it was floating.
I blew air into the bag and sealed the other end. You have to be quick or you will loose air. I then hand sewed a pouch to slide the bag into the costume.
I followed the pattern for the hat using black felt again. I stuffed the costume with newspaper and pillow stuffing.
Pool chalk: Take a square box and cut the top of for the bottom part. Cut circles for the arms and top with a painted foam top. Cut a hole for you head and write the words on the box.
Pool table: Rectangle box covered with green felt cut holes and fill with black felt. I took wood contact paper and covered the rest of the box. For the edge of the table I folded the cut parts of the box and covered with the contact paper for support. I used the green felt as suspenders. For the balls I painted each and hot glued the foam balls to the table. The pockets are a nice beer holder for friends.
Pool Stick: Foam body covered with tan felt and dark brown bottom. Head of the stick is foam and covered in same felt topped with white and then finally with green felt to match the chalk.