We have applied our procedure to images of twelve blazars monitored at 15 and 22 GHz with the VLBA in 1996 by the Brandeis Radio Astronomy Group, yielding six epochs of polarization sensitive images separated by about two months each. Details of this monitoring program are discussed by Homan et al. (2001) and references therein. These data are sufficiently well sampled in time that a simple linear interpolation between two adjacent epochs yielded satisfactory results. The movies show clear superluminal motion, and reveal the complexity of the evolution of the magnetic field structure in these sources. These movies have provided a highly visual medium in which to show our work for scientific talks, general lectures, and are on our WWW site.7 BAMM, instructions, other AIPS macros, and our ``Superluminal Magnetic Movies'' are available to the public by following the links in our WWW site or by contacting one of the authors (CCC).