We introduce a model colloid system comprised of particles dispersed in a viscous solvent that can be applied to 3-D direct visualization studies of suspension structure, dynamics and rheology. The colloids are poly(methyl methacrylate) (PMMA) sterically stabilized by a copolymer of poly(dimethyl-diphenyl) siloxane that matches the refractive index of PMMA. The monodisperse particles, synthesized with mean size of about 1 micron, are stably dispersed in solvents of poly(dimethyl-diphenyl siloxane) with viscosity in the range of ~ 1 Pa s. As opposed to other classes of PMMA colloids dispersed in organic solvents, this system displays minimal charge interactions. At room temperature, pair potential interactions (measured by extrapolation of pair correlation functions to infinite dilution) are well modeled by the Lennard-Jones potential with dimensionless interaction energy or order unity. We use the system in conjunction with confocal microscopy studies to measure: (i) the radial distribution function in 3D at dilute concentrations; (ii) the colloid self-diffusivity in 3D at dilute concentrations. Both measurements, neither previously reported in uncharged systems, are facilitated by the slow, viscous dynamics of the system. We also show that the viscosity and particle size of the system are such that the high-volume fraction shear thickening transition can be accessed at shear rates amenable to direct visualization.