  Mott insulating ultracold gases posses a unique whole-atom exchange
interaction which enables large quantum fluctuations between the Zeeman
sublevels of each atom. By strengthening this interaction---either through the
use of large-spin atoms, or by tuning the particle-particle interactions via
optical Feshbach resonance---one may enhance fluctuations and facilitate the
appearance of the long sought-after quantum spin liquid phase---all in the
highly tunable environment of cold atoms. To illustrate the relationship
between the spin magnitude, interaction strength, and resulting magnetic
phases, we present and solve a mean field theory for bosons optically confined
to the one particle-per-site Mott state, using both analytic and numerical
methods. We find on a square lattice with bosons of hyperfine spin $f>2$, that
making the repulsive s-wave scattering length through the singlet channel
small---relative to the higher-order scattering channels---accesses a
short-range resonating valence bond (s-RVB) spin liquid phase.
