The proprietor of the blog "strange maps" looks for "maps that are ‘different’, tell a story, probably aren’t in any atlas and are nice to look at to boot..." There are 144 of them here so far. You may already be aware of this site, it's had over 2,000,000 visitors since September 2006.
Take a look at #131. The name of every U.S. state is replaced by the name of the country whose GDP it equals: 131 - US States Renamed For Countries With Similar GDPs. Then look at #135, which provides more background to #131, and provides some variants: 135 - Update On the GDP Map of the USA.
The basic #131 tends to sweep up smaller - but not negligable countries. Here is a variant, in which groups of U.S. states are compared to the GDPs of the countries with the next four largest economies:
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