The introduction of a color customization feature in ECO gives a dynamic and engaging experience for players. This proposal envisions a system where players initially access only natural, muted dyes derived from materials like powdered stones, plants, and insects which do not give players a simple start of primary colors but force them to explore complex hues. They can be mixed together in accordance with the subtractive color mixing model found in real-life in specific ratios to create a range of shades. The uniqueness of this system lies in the varying acquisition methods for different pigments, adding value to certain colors over others.

As players advance technologically, the palette expands, allowing access to deeper and more saturated colors. This progression not only enhances the visual diversity of the game but also enables players to distinguish themselves, encouraging their desire for individuality. In the later stages of the game, synthetic pigments could introduce a wide spectrum of affordable colors but with an added challenge of less predictable color mixing results due to chemical reactions where the combination of ingredients is not a simple average of them but a totally new color.

This feature could also strengthen player interaction and give a new breath to existing professions. Millers could compete to create unique hues, adding an element of challenge in replicating specific shades. Some colors, derived from rare or nearly extinct species, might be more expensive or simply unavailable due to governmental restrictions, encouraging players to explore alternatives that are perhaps less attractive but more accessible.

Integrating additional species for pigment production, like plants, insects, and small animals, would enrich the roles of gatherers and hunters. Similarly, introducing rare minerals could revitalize the mining profession, adding elements of exploration and unpredictability, making it less monotonous.

Implementing this feature is undoubtedly a substantial undertaking. However, the potential to enhance player engagement, especially post-midgame where a decline in activity often occurs, is significant. This system of collectability and customization could be a key factor in sustaining player interest and motivation over the long term.