Snappy's recent post Healing Earth (read it here) mentioned the work of the charity Thrive. I know first hand what such a superb job they do and if you keep a Christmas charity list then maybe you'll consider donating to them (find out more about Thrive here).
At the Friary Fete this summer my wife and I shared our stall with Sue Stuart from Thrive. Sue was selling hanging baskets with plants sourced from Thrive gardening clients (that is how they like to regard their people - not as patients or disabled) and we were selling dried herbs harvested from the monastery garden - bay, rosemary, lavender and sage. We thought branding them Heavenly Scents was just too corny.
Next year we are also planning a line of drought resistant hanging baskets, really herb baskets planted with varieties that can best withstand those conditions. All we need is to source some inexpensive decorative herb pots and Thrive's clients will grow on the plants.
Here are some pictures of the Herb Garden (actually full on vegetable production, medicinal herbs and dye plants) gardened by Thrive clients in London.