  In the absence of a Grand Unified Theory framework, connecting the values of
the mixing parameters in the quark and lepton sector is a difficult task,
unless one introduces ad-hoc relations among the matrices that diagonalize such
different kinds of fermions. In this paper, we discuss in detail the
possibility that the PMNS matrix is given by the product U_{PMNS}=V^\ast_{CKM}
T^\ast where T comes from the diagonalization of a see-saw like mass matrix
that can be of a Bimaximal (BM), Tri-Bimaximal (TBM) and Golden Ratio (GR)
form, and identify the leading corrections to such patterns that allow a good
fit to the leptonic mixing matrix as well as to the CP phase. We also show that
the modified versions of BM, TBM and GR can easily accommodate the solar and
atmospheric mass differences
