Apparently it's not only possible, but insanely easy to make Bose Einstein Condensates of photons. I'm not sure why you'd need a giant photon but apparently science can now make them. A single quantum mechanical photon is pretty much a laser, and those were pretty useful. Not that such things need to be useful to be awesome. Somehow a giant quantum mechanical equivalent of a photon is likely more useful than the quantum mechanical of a sodium atom.
http://www.nature.com/news/2010/101124/full/news.2010.630.html
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