  Recently, a new kind of two dimensional (2D) artificial electron lattice,
i.e. molecule graphene, has drawn a lots of interest, where the metal surface
electrons are transformed into a honeycomb lattice via absorbing a molecule
lattice on metal surface. In this work, we would like to point out that the
technique used to build molecule graphene actually gives a promising way to
explore the interesting physics of other novel 2D lattice beyond graphene. The
key issue is that this system is an antidot system, where the absorbed molecule
normally gives a repulsive potential. So, we need to establish a map between
the molecule arrangement and the desired surface electron lattice. To give a
concrete example, we first analyse the effective models of molecule graphene,
and estimate the model parameters for the Cu/CO system through numerical
fitting the exerimental data. Then, we design a molecule lattice, and show
that, with this kind of lattice, the surface electrons can be transformed into
a Kagome like lattice. Using the estimated parameters of Cu/CO system, we
calculate the corresponding energy bands and LDOS, which can be readily tested
in experiment. We hope that our work can stimulate further theoretical and
experimental interest in this novel artificial 2D electron lattice.
