I use the triangular grid on my largest show at SCREAMS its very disorienting. straight walls are still straight, jut the turns are different, 60 or 120 degree angles. There is a program to help lay them out but I normally just use graph paper.
http://www.boopack.com/software.html

http://www.printfreegraphpaper.com/gp/i-i-12.pdf

I really like the way the grid lays out, nice cubbys for sound and pop ups as well as great actor hides. It works really well and helps to make that show stand out from the others.
Allen H