Metamorphic rocks are created when a rock is subducted and squeezed/cooked (but not melted).

Examples include gneiss (metamorphosed granite), marble (metamorphosed limestone), and slate (metamorphosed shale, which is mudstone).

Here is marble in the wild:

http://wrgis.wr.usgs.gov/open-file/of99-168/of99-168-pamphlet.html

and here is marble in a different environment:

http://www.humboldt.edu/~afr2/2000/album/juday/

http://www.wirednewyork.com/skyscrapers/trump_tower/default.htm

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