Non-perturbative studies of non-Abelian gauge theories have received widespread attention in recent months. In particular, SU(2) and SU(3) Yang-Mills theories in the absence of fermions have been studied numerically as lattice gauge theories. Monte-Carlo integrations of Feynman path integrals have been evaluated to obtain expectation values of quantum operators. These same numerical techniques are well known to condensed matter theorists, and have been developed and applied to study spin systems.