Changing hair colour by use of dye or a wig or, more recently, Photoshop, has been around for ages (with exception to the latter point). The reasons for changing hair colour may be as simple as for a Halowe'en costume, as reasonable as covering up gray hairs, or as complicated as "just because".
The following are by wonderful people who have either a) dyed their hair, b) wore extentions/wigs, c) photoshopped it, or d) are in possession of a natural hair colour. Enjoy! :D
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