There is an awkward spot between the stairs to my deck and our house.  We decided to use this space for our new herb garden.

Materials:
- 1 inch drywall screws and large washers for them
 - Wooden crates (I picked mine up for $10 at a craft store)
 - Water proofing sealer
 - Landscape fabric or other outdoor fabric
 - Soil or soil mix
 - Herbs
 - Staple gun and staples
 
First I waterproofed the wooden crates thoroughly.  My crates weren't exactly designed for the elements, so I gave them several coats.  You might want to avoid wooden crates that are treated or that have cedar wood, as they usually aren't recommended for growing edibles.
I then lined the crates with landscape fabric with the help of my wife and stapled them in place.  I left the fabric down a bit from the top so I could mostly cover it.
My wife then held the crates in place while I screwed them to the deck stairs.  Use as many screws and attachments points as you need.  I had to add a couple more after filling with soil since they were sagging a bit.

Fill with soil or soil mix.  I prefer to use composted manure.
Add herbs.  Lavender, sage, parsley, chives, rosemary, etc.  I also planted onions sets between the plants.


Keep watered well.  Because of the use of porous fabric and light soil mix, they will needed watered frequently during hot weather.  A drip irrigation system will be attached to mine soon.