A collage and an assemblage are pictorial techniques that use various materials, which are most often found in the surrounding. The collage is created by combining two-dimensional materials, while the assemblage is created by assembling three-dimensional and two-dimensional materials (Šuvaković, 2005). Artists often pick and choose useless and worthless items from their everyday lives as materials that they are going to use in collages and assemblages. Therefore, the collage and the assemblage are being associated with the concept of junk art. Found and loose materials are accessible and useful for boosting creativity because they are not suggestive regarding their usage. In the kindergarten group, through prepared activities, it was planned to boost progress in various areas of children's development. Interrelated items, whose progress is planned, are divergent thinking, creativity, skills of combining and upgrading materials in space, in all of three dimensions, coordination and precision in manipulating materials, cooperation among children and a positive attitude towards art. Throughout two forenoons, in the district facility of the kindergarten Trešnjevka, children aged 4 to 5 participated in prepared activities. During the four activities, children created five mirror assemblages, six assemblages made of loose materials without using any binder, a suitcase assemblage and two magnetic assemblages. The variety and abundance of materials are some of the factors that encouraged children to freely explore and experiment with combining materials, which resulted in very creative artistic solutions. The kindergarten group exuded a pleasant and creative atmosphere, children were interested in activities, very creative and willing to cooperate. Through these activities, progress has been made in various areas of children’s development, that is, the holistic development of children has been enabled. Therefore, it is very important to do similar activities in kindergarten groups because of the numerous positive effects on children's development.