Maps are ubiquitous but I've never seen so many as on my recent trip to northern Michigan. They love their state's shape. It appears on everything (with or without the Upper Peninsula) from jewelry to buses to chairs
to the obvious oven mitt.
There is even a Handmap Brewing Company.
Arriving at the airport in Traverse City you see these nice artistic map tiles of the surrounding bays and peninsulas on the bathroom walls.
The stores are full of map-centric merchandise. Here is a shelf of coasters at My Secret Stash.
Here are a couple of map themed glasses.
I bought this Tolkien themed shirt there.TeeSeeTee -nice logo! -
has all kinds of great map themes including Dr. Suess,
Another store. Momentum Outfitters has an impressive collection of woodcut maps of seemingly every lake, bay and island within a 500-mile radius. The underwater depths are kind of fascinating - to me anyway.
There were many good maps along the way including this in the Mission Point Lighthouse,
and this nice map showing the past and present of Glen Haven in the Sleeping Bear Dunes National Seashore.
Part of this larger sign.Moomers) has maps you can pin.