I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
I am not aware of any particular book that give such a landscape perspective but here are some plant suggestions that fit your request.
For grey plants keep in mind that such colors often end up with disease problems in rainy Gulf Coast regions. I would consider trying dusty miller, powis castle artemisia, and perhaps bush germander (Teucrium fruticans). For green there are many options but I think the compact southern magnolia variety 'Little Gem' would be nice as would Bright N' Tight Carolina Cherry Laurel. For purples in bright shade try Persian Shield (Strobilanthes dyeranus), and Chinese witchhazel (Burgundy is a good variety). This should be a good start.
Thanks for the question. Best wishes for a wonderful gardening year in 2007. Please stop in again soon!
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