In this study a detailed examination was carried out of variables that control the wrinkle morphology observed in p-toluenesulfonate doped polypyrrole films formed by electropolymerization on tin-doped indium oxide (ITO) coated glass using either methanol/water or water alone as solvents. Results are in agreement with an earlier study in which the porous nature of the substrate was identified as the most influential of the factors controlling the morphology. Other factors found to be important included : nature and size of the dopant ions, solvent, and concentrations of pyrrole and dopant. Examination of still-moist free-standing conductive films by light microscopy demonstrated that the wrinkles are not an artifact due to post-deposition shrinkage.