I really love using reversed audio in my music, like when I want to achieve a kind of haunting or eerie atmosphere. Maurizio Giri has created a Max for Live audio effect - Grain Reverser - that does this by producing grains of reversed audio input in which each grain can be filtered and/or transposed.

Have a look at the demo video:

Download Grain Reverser

This way for heaps more Max for Live devices & tips.