In this seminar I will discuss the optical properties of amorphous arrays of plasmonic and dielectric spherical nanoparticles. In such arrays, the spheres are placed randomly under assumption of specific center-to-center distance. I will show that by modifying spatial distribution and size distribution of nanoparticles it is possible to obtain optical properties that deviate significantly from respective single particle optical response. Also, the contributions of electric and magnetic dipolar modes will be discussed for the case of dielectric nanoparticles.