The pre-created styles for walls, floors, and ceilings are lovely, but I find myself itching for the ability to do custom paint jobs. Since herbs are currently under-utilized in comparison to crops (herbs can exist as seeds, sprigs, or essences, compared to the huge variety of foods, sauces, drinks, and cocktails that crops can turn into), why not introduce a new skill branch for turning those brightly colored seeds or flowers into color dyes? Add dye to eggs, and with the right skill set you could get egg tempera paint.
Once there's paint, well, anything from painting murals to tinting butterflies new and dramatic shades seems possible...