  We consider models for the di-photon resonance observed at ATLAS (with 3.6
fb^{-1}) and CMS (with 2.6 fb^{-1}). We find there is no conflict between the
signal reported at 13 TeV, and the constraints from both experiments at 8 TeV
with 20.3 fb^{-1}. We make a simple argument for why adding only one new
resonance to the standard model (SM) is not sufficient to explain the
observation. We explore four viable options: (i): resonance production and
decay through loops of messenger fermions or scalars; (ii): a resonant
messenger which decays to the di-photon resonance + X; (iii): an edge
configuration where A -> B gamma -> C gamma gamma, and (iv): Hidden Valley-like
models where the resonance decays to a pair of very light (sub-GeV) states,
each of which in turn decays to a pair of collimated photons that cannot be
distinguished from a single photon. Since in each case multiple new states have
been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC.
