Posters, either as promotions by various ELT publishing houses or prepared by ELT teachers and students, are widely used on the walls of many foreign language classrooms. Many of them consist of colourful pictures along with L2 vocabulary, grammar, and texts in order to contribute to the foreign language learning process. However, many ELT teachers envisage posters only as decorative class motifs rather than as educational tools in and of themselves. The aim of this study, conducted in a private Turkish primary school, is to show that students can actually enhance their L2 vocabulary knowledge through posters as a result of self-directed learning.