I am making a corn maze for my kids on the side of my house... I just played with a grid paper to get a design I liked that would fit in the area in question. I'll be using flour on the ground to mark off areas to be sure they are even and straight, etc, and then planting accordingly.

I'm sure it can be done in a similar way, just using whatever hedge you want to use! :) Take fully grown size into consideration as you plant, and put a wee bit closer than they recommend so you can have them form walls. :)