Just wanted to share our gutter garden, which we built three years ago and replanted on Earth Day (inadvertently).
I did a post on it and how to build it against an existing fence on my blog. The materials (8'-0" gutter (cut), hardware, caps, etc. are outlined in the post. We have very little outdoor space to call our own, so this was a fun project for us.
You can find out more about the progress of the gutter garden on Tiffanie's blog.