This was a very satisfying project. They approved my design, which included a dry stream bed, some anchor plants, a hypertufa boulder (the smaller of the two that had been used in the 2009 Cincinnati Flower show) with some ground cover plant pockets, and suggestions of completed planting, which would be the garden club's responsibility (along with maintenance).
I created a mock-up using photoshop and some photos of the area, and from that design, proceeded to construct the bed (with a little 'slave labor' from John to excavate the stream bed and haul the oversized gravel.) The plant choices were hopefully to inspire kids to build twig fairy houses in the branches, or in the shade of the perennials. It included a small stone cairn that I imagined storing raw materials in, but which ended up being used like a dwelling.
They sunk a dark blue basin into the stream for a water feature, and incorporated the fanciful bird bath & other statuary they already had. The result was quite charming.