In textile design, the characteristics of a textured surface are the result of the properties of the materials, the textile techniques used, and the colour mixtures associated with each technique. The perception of colour on textured textiles is dependent on the angles of viewing and incidence of light on the surface. Accordingly, when analyzing the perception of the colour of pile textiles such as velvet, we observe that the orientation of the piles on the surface affects the perception of colour. The perception of colour and its transformation depends on whether the light is reflected off the side or the end of the yarn. By bringing do it yourself (DIY) materials into the textile design field, this research questions how biomaterials such as bioplastic can be further developed using textile surface design methods, and how the relationship between texture and colours can be advanced in the design of complex textured surfaces. The method develops a hybrid strategy for designing a new material category combining DIY and digital tools, which offers a more sustainable alternative to conventional textile materials. Moreover, the method proposed builds on two major aspects: explorations of bioplastic materials and their impacts on colour design and selection, and an analysis of changes in the visual perception of coloured surfaces with regard to differences in texture, the positioning of a light source, and angle of viewing. The results are methods of creating complex colour combinations and textural surfaces using near‐adjacent and complementary colours and the intrinsic transparency property of bioplastics.