Please make a restaurant of some sort! If you could do this, in any fashion, my upcoming campaign would be far more flexible. Plus it would have a wide variety of uses elsewhere. A simple grill and fry basket, dishwasher, and a few sets of counters and stools, tables and chairs, of different colors. (It's times like these that make me wish I knew photoshop better).
Perhaps some near-empty shelves, with non-descript items. This way, you could set up a looted store, or a store in a smaller town that isn't fully stocked. Some aisle shelves would be good too, (the ones generally used in large chain stores). Not sure what they're actually called.
What about a gas station? Pretty much, we would just need a set of pumps, as the store and shelves could represent the actual building. Just toss the pumps on a connected asphalt tile.
I know this may fit better under Streets of Mayhem, but street signs would be great. Just have the names of the streets blurry, so they can't be read.
What about a large dumpster? (The kind generally used in retail chains and restaurants).
Of course, if you could somehow come up with a car in a few colors, that would be great too
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Hell, I might just have to take a stab at some of these. Never really sat down and thought of what I would like to see added to the set.