  Aims. We map the temperature structure of the intra-cluster medium (ICM)
within a nearly complete X-ray flux limited sample of galaxy clusters in the
redshift range z=[0.045,0.096]. Our sample contains seven bright clusters of
galaxies observed with XMM-Newton: Abell 399, Abell 401, Abell 478, Abell 1795,
Abell 2029, Abell 2065, Abell 2256.
  Methods. We use a multi-scale spectral mapping algorithm especially designed
to map spectroscopic observables from X-ray extended emission of the ICM.
Derived from a former algorithm using Haar wavelets, our algorithm is now
implemented with B-spline wavelets in order to perform a more regular analysis
of the signal.
  Results. For the four clusters in our sample that are major mergers, we find
a complex thermal structure with strong thermal variations consistent with
their dynamics. For two of them, A2065 and A2256, we perform a 3-d analysis of
cold front features evidenced from the gas temperature and brightness maps.
Furthermore, we detect a significant non-radial thermal structure outside the
cool core region of the other 3 more "regular" clusters, with relative
amplitudes of about about 10%. We investigate possible implications of this
structure on the mass estimates of the "regular" clusters A1795 and A2029, by
extracting surface brightness and temperature profiles from sectors
correspondings to the hottest and coldest regions in the maps. While
compensating with surface brightness for A2029, leading to consistent mass
profiles, the temperature structure leads to significant mass discrepancies in
the innermost region of A1795.
