In this paper we focus on creativity needed for geometric tasks designing, visualization of geometric problems and use of ICT. We present some examples of various problems related to tessellations. Altogether 21 students--pre-service teachers participated in our activity within a geometry course at CPU in Nitra, Slovakia. Our attempt was to familiarize pre-service teachers with different teaching methods and approaches since we consider it highly important to make them aware of problems of educational process. Students became familiar with tessellation and within the described activity they solved application tasks using didactical software GeoGebra. Tessellation is considered an appropriate means of motivation and activation of students in mathematics. In the paper there are also students' solutions presented.