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Just got around to taking a couple of pics of how I mute my guitar for late night practice. The rolled cloth is just a soft cleaning cloth for glasses. The foam is soft and I cut a few grooves in. Both are easy and both give enough sound to figure out what your're doing. Believe it or not, the cloth does a better muting job. The advantage of this system is being able to pick a performance level, giving you a realistic feedback to your picking technique.
I use this when I'm doing some repetitive timing exercises at the beginning of my woodshedding. I remove the mute and enjoy the acoustic sound when I'm doing something not so repetitive, though I might be playing softer, working through some fingerings, etc.
I still use the Yamaha Silent guitar, but I think muting my actual instrument could be a better solution overall because I'm practicing on my actual performance instrument.