I was just tooling around and saw a picture for this neat set, I thought maybe it was a broken old fountain recycled. I just posted enough to get your attention the link will take you to the full article as well as the directions on how to do this. Maybe someday, I'll get to do this. :)

How to make a Herb Spiral

For gardeners living with limited space, a herb spiral may be a good method to incorporate some of your favourite herbs into the garden. It winds its way from the base into the centre perched more than a metre above ground level giving enough room to nearly all your herbs.

The herb spiral is a permaculture gardening method that uses nature to its full potential. Gravity allows the water to seep through the levels meaning that the plants at the top get full drainage while the ones at the bottom may reside in a simple bog. It also gives your herbs shady spots with varying degrees. The herbs that need full-sun can be grown in those positions while more shade loving plants can be located on the opposite side.