One of our favorite ideas from Garden in a City was the use of recycled everyday/industrial materials as ornaments for a parkway garden. The "Reusable Parkway" was done by Christy Webber designers Tony Butterworth and Brian Wildman. We really like the wine bottles used as pavers and edging - the mix of colored glass and the variance between the fully submerged pavers and the random heights of the edging looks organic and happily imperfect.