I've got to read that FMA x SPN one. Aaaaand, since one good turn deserves another - there actually is a Hellblazer x BtVS story in which Constantine and Ethan Rayne encounter each other: Border Men (http://www.dymphna.net/ucsl/archive/janete-bordermen.txt), by 3jane and thete1. (I'm going to assume you don't need warnings, since, well, John Constantine and Ethan Rayne.)
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I've got to read that FMA x SPN one. Aaaaand, since one good turn deserves another - there actually is a Hellblazer x BtVS story in which Constantine and Ethan Rayne encounter each other: Border Men (http://www.dymphna.net/ucsl/archive/janete-bordermen.txt), by