Kata Kolok is a small and young signed language used in two neighbouring villages of North Bali. In Kata Kolok, all indications of colour are based on visual iconicity, which allows for contextual flexibility and high variability among signers. There are three different strategies to convey colour information, all iconic-indexical. First of all, in spontaneous conversations signers often point towards objects in the vicinity which have the colour which they would like to express. For example, one might point to a colour on one’s sarong. Second, pointing to indicate colour is conventionalized for white, red, and black which are referred to by touching teeth, lips, and hair respectively. A third strategy is to produce signs for objects which prototypically have that colour. There is a high degree of variation between signers in the choice of objects. For example, one might choose either banana or turmeric to indicate the colour yellow. One possibility is that this variation is due to the limited time depth of the language and the relatively small size of the signing community. A comparison between young and small sign languages like Kata Kolok to larger and more established signed languages, such as American Sign Language, suggests that conventionalization of colour is a function of expressive mode, cognition, critical mass, and time.