fooling around with gridflow lately (and I'm enjoying it a lot!)
one nice addition in GridFlow 0.9.5 has been the c2p/p2c R² operators (respectively cartesian-to-polar, and polar-to-cartesian)
just wanted to share this demonstration: http://dl.getdropbox.com/u/89643/gf_spirals_and_moire.avi
as well as this: (not truly 1-bit though) http://dl.getdropbox.com/u/89643/gf_spirals_and_moire_take2.avi
full ChangeLog for 0.9.5 release is at: http://gridflow.ca/svn/tags/gridflow_0_9_5_b/ChangeLog the patch I used to make the videos can be found in the examples directory of GridFlow (svn)
cheers
~ mescalinum