This work describes a new route for producing bulk materials from extremely high loading levels of inorganic nanoparticles, approaching 80%, while maintaining optical transparency. More specifically, LaF3 nanoparticles with trifluorovinyl ether (TFVE) ligands were synthesized. Because a single nanoparticle will have many functional ligands attached to its surface, the nanoparticles themselves act as cross-linkers, without the need for a matrix phase for the composite, promoting homogeneity and reduced optical scattering. In order to distinguish these new types of composites from traditional nanocomposites, they are referred to here as "omni-composites because the material is composed entirely (Lat. omnino) of composite nanoparticles.