The new Toy is call Tweak mode created by Gal Sasson (galsasson.com/tweakmode/)
Here is just a little test for showing the result.
You can follow the simple few step here:galsasson.com/tweakmode/
or my blog: pandalabccc.blogspot.nl/2013/09/new-toy-for-processing-tweakmode.html
Then you will have a real-time interactive control slider in your Processing code to manage your variables and parameters.