I'd like to suggest that a feature/option be created to allow players to customize dye colors that are not already available within the game or via the Online Store.

Give players the ability to use either a color wheel selector or input a specific hex color code to create a more specific dye color and then purchase that selection in either single dye buckets or a set of 10, via the online store.

This would not only allow players to have more variety and personalization in their color schemes, it would also generate more revenue. I know I'd purchase dye this way, given the rather limited color options currently available.