What is a sustainable way of stacking?

In modern Tetris, there is a system of piece randomization that takes a bag of seven pieces, and takes them out of a bag so that there is an even frequency of each piece. How can I use this fact to stack so that the playing field is always level, and it repeats itself indefinitely?
Obviously, this is not a good way of stacking in Tetris Battle, because it is neither offensive nor defensive, but it is a good way to keep the stack low.
Best Answer
With enough piece previews, and hold, it is possible to play forever using some loops, though they do not always keep the stack low, and with higher gravity/speed settings aren't always possible.
The techniques are well detailed in this Playing forever article, so I won't repeat them.
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