For several years I have been selling note cards showing my architectural photos in two wonderful local gift shops. I've taken the photos at various locations around the downtown and UM campus areas in Ann Arbor. Each card has a blank inside for your personal note, the name of the architect on the back, and comes with an envelope.
The cards can be purchased at:
The Peaceable Kingdom http://theaapk.com/
Found http://www.foundgallery.com/
Even if you're not interested in the note cards, I encourage you to visit both shops, as they are filled with unique and memorable items that you'd be hard-pressed to find anywhere else.