Bake a sheet cake the size that you need.
With an icing filled bag and round tip, size #5, draw the pumpkin on the cake top.
Cut the cake away from the pumpkin shape.
You will use star tip, size #18 to fill in the entire pumpkin. First make a small amount of black icing and fill in the pumpkin's eyes, nose and mouth.
Next make a small amount of yellow icing and fill in the stem on the pumpkin.
Now make a green colored icing and a yellow-green color icing and fill in the leaf.
Make bright orange icing and fill in the rest of the pumpkin.
Write your message on the board in orange icing using your round tip, size #5.