Could you add a few flowers in there? Not sure if you can geograft from existing plant models? It might take too much time though.
The Fanta Star, Forget-Me-Nots or cherry blossoms would be small enough to get just a little pop of color in there.
My hope is that Lisa will have time and interest in adding in ivy and/or roses or other flowers. Could be other seasonal types of elements or themes that could really add interest and value.