Future developments in nanotechnology require the complex arrangements of nano-sized objects at a reasonable cost. Although less established than other manufacturing standards, approaches based on colloidal nanoparticles (NPs) are cost-effective and go beyond intrinsic limitation of lithographic methods. Plasmonic nanoparticles (Au, Ag) are used here as building blocks because they can support light-driven collective electron oscillations, known as localized surface plasmon resonance. Interestingly, the crystallinity of such NPs can be well controlled and can often form complex three-dimensional structure with nanometric precision on the interparticle distance, so called supercrystals. Moreover, various self-assembly approaches can produce a large variety of new plasmonic nanostructures with a minimal synthetic effort. A large range of plasmonic response can be obtained depending on the orientation and nanostructuration of the NPs. For instance, plasmon coupling can take place when AuNPs enter into proximity, resulting in amplified electromagnetic fields at the junction between NPs, the enhancement being more intense as the distance decreases. Devising colloidal plasmonic materials is a highly transverse field that should be seen from an interdisciplinary perspective. Besides the rich physics associated with the optical response (e.g. heat generation, carrier recombination), the nanoparticles are prepared by wet chemical approaches and stabilized by a soft corona of ligands giving properties like solvation, colloidal stability, surface chemistry and often tunable interaction. Depending on the technique used to assemble the nanoparticles, other field of physics should be taken into account such as wetting, capillary flows and so forth. This manuscript presents efforts towards shaping plasmonic NPs as well as controlling their arrangement at different length scale.