Multi flash mounts are cool. I have discussed them before when we did a DIY on a dual flash mount. Just a quick recap: Using multiple flashed allows you to either drive more light or to remain on the same light level, while recycling faster. You can read it all here.
Using some objects that my wife will call junk elements smartly scattered around the house, photographer Brent Pennington made a three-way flash mount. Ha! Three is better than two. It will drive a stop and a half more.
Of course, you could always sin and get the one made by Lastolite, but then where would all the fun (and your 70 greens) would be?