Computer graphics concepts have a high visual component. For that reason, teaching this subject should be enriched with the use of small applications showing concepts like near and far plane or objects hierarchy in real time. However, their development is usually time consuming. In this paper we propose the use of an open source engine called Nebula to create such examples. We will show that Nebula applications are easy to develop and modify, presenting three small applications that help to explain important concepts in Computer Graphics curriculum. Categories and Subject Descriptors I.3 [Computing Methodologies]: Computer Graphics; K.3.2 [Computers and Education]: Computer and Information Science Education—Computer science education General Terms Algorithms, Human Factors, Theory Keywords Computer graphics, game engines, education