Holly-- I would suggest trying any of the UM bookstores.... Ulrichs, Michigan Union Bookstore and Michigan Book and Supply. I know they sometimes have pictures, but they also have postcards of downtown A2. If you want the postcard made to a larger pic, just take them to CVS and use the picture maker. You can even change the color to black and white. Shaman Drum might even be useful to. There is also the Middle Earth on South U and I believe a poster/picture place 2 doors from it and one on South State where Red Hawk and all that stuff is. That's if theyre still there. You might also try the UM Museum of Art too.
Checkered and stainless steel stuff also seemed to be a big theme in the '50's.

Hope this helps a lil.

Tonya