  Colloidal model systems allow for a flexible tuning of particle sizes,
particle spacings and mutual interactions at constant temperature. Colloidal
suspensions typically crystallize as soon as the interactions get sufficiently
strong and long-ranged. Several strategies have been successfully applied to
avoid crystallization and instead produce colloidal glasses. Most of these
amorphous solids are formed at high particle concentrations. This paper shortly
reviews experimental attempts to produce amorphous colloidal solids using
strategies based on topological, thermodynamic and kinetic considerations. We
complement this overview by introducing a (transient) amorphous solid forming
in a thoroughly deionized aqueous suspension of highly charged spheres at low
salt concentration and very low volume fractions.
