Nancy Zieman of nancy's notions has compiled a very nice book and CD on landscape techniques. They also sell "landscape-type" fabrics.
I have done a couple different types of landscape quilts....it takes "just the right photo" to inspire me. On my picture site, I have one of a "Train" that I did...I cut out the "doo-dahs" as I called them, put fusible on the backs, then satinstitched around everything! I also did some shading and highlights with colored pencils. I really enjoyed the process.
http://flickr.com/photos/blewbird/
I must admit...I haven't done ANY landscape quilts since I purchased books on technique! I enjoyed the "seat-of-the-pants" technique the best!