Hi,
attached is an abstraction for generation of "colored" noise (http://en.wikipedia.org/wiki/Colors_of_noise) using a relatively new method (by J.N. Kasdin, 1995) that uses frequency domain multiplication. White, pink, brown noise (and intermediate flavors) can be obtained by varying a single parameter (the slope of the spectrum in a linear log(PSD)-log(f) plot). I searched a bit in the archives and it seems to me that in for noise generation in PD we actually have noise~ (uniform white noise), pink~ (from zexy and cyclone) and a variety of filters, but no direct generation of 1/f^a noise (am I right?).
Inside the archive there is a short readme, look at it first. To me the patch sounds a little "tubby", let me know if you have the same feeling.
Any comment, suggestion for improvements is welcome.
The abstraction lives in http://www.puredata.org/Members/AlbertoZ
All the best,
Alberto Zin