Selected with the primary objective of studying the differences between BL Lacs and their closest relatives, a sample of 55 optically bright, low luminosity core dominated radio sources has been studied. The spectroscopy carried out for this sample, however, yielded not only BL Lacs but also a completely unexpected number of sources with strong emission lines (much like those found in Sy galaxies), and almost 50% of galaxies with weak (EW ≤ 30Å), or absent emission lines. Such optical diversity is at odds with the traditional unification schemes for low luminosity AGN and it has prompted an optical imaging campaign. High resolution optical images obtained at NOT are discussed, in particular the central colours and profiles of the different types of sources found in the sample.