Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Vertices Escondidos
In Spanish. This is a basic introduction to tessellation and various learning activities dealing with tessellations.
University of Cambridge
University of Cambridge: Nrich: Building Stars
This interactive activity gives you an opportunity to color in a tessellation that is different from the usual. Read the short introduction to find out more about this tessellation that doesn't repeat.