x This study aims at identification of gender-based colour differences among 7-9 years old children at single-gender schools in an Islamic country. This will help to better understand the effects of certain educational environments on children's tendencies towards specific colors. In this study multi-stage cluster sampling was applied to select a total of 100 students (50 boys and 50 girls) among 7-9 years old children chosen from one all-boy and one all-girl elementary schools. The color preference in children was evaluated based on Luscher colour test and the results were analyzed according to Uman-Vitni and Kruskal-Wallis nonparametric tests. It is found that a significant difference exists between boys and girls tendencies towards four colours including blue, green, pink and black. In addition, it is observed that with age, children preference in yellow colour will vary considerably with their age. (C) 2013 The Authors. Published by Elsevier Ltd.