If you never dived into it, here´s a nice overview of the cool Beat Repeat Ableton stock plugin.
Slynk created a cool stereo widener only with internal Ableton Live devices
You can download this .adg file here and load / store it in Live.
This free M4L device made by Dillon Bastan and Carlo Cattano let´s you create custom Wavetables for Ableton´s Wavetable synth from image files. Get it from www.maxforlive.com
Here´s another nice Ableton tip from Patches.zone. How much time do you waste setting up again and again the same standards for your Ableton plugs? Read here how to change your default settings (Click the pics for results)