intentional and permanent reconstruction of biological features (eg. Negroid, Caucasoid, etc.) to mimic those historically recognized as indicating a different race, then I think the following examples would qualify:


http://i1-news.softpedia-static.com/images/news2/Sammy-Sosa-Admits-to-Bleaching-His-Skin-2.jpg

^^ Maintains Dominican-American ethnicity; permanently reconstructed skin color, hair texture, and eye color from those indicative of black race to those indicative of another race


http://plasticsurgeryfact.com/wp-content/uploads/2014/09/Michael-Jackson-Nose-Job-Before-and-After.jpg

^^ Maintained Black American ethnicity; permanently reconstructed skin color, hair texture and nose shape/size from those indicative of black race to those indicative of another race


http://honeygerman.com/wp-content/uploads/2014/10/Tiny_Eye_Color_Surgery_Honey_German.jpg

^^Maintains Black American ethnicity; permanently reconstructed hair texture and eye color from those indicative of black/mixed race to those indicative of another race


http://www.inquisitr.com/wp-content/uploads/2015/06/Rachel-Dolezal-Before-and-After-665x385.jpg

^^Rachel Dolezal is a poor example because of her fraudulence. However she still seems to display some degree of race dysmorphia, regardless of her deceptions.


Now, is there a plausible mechanism to try and understand what would motivate some people to permanently alter their biological features to those of a different race?? Probably. It doesn't seem to be well-characterized, but it likely involves some combination of personal insecurities/self-hate, a lingering global standard of Caucasian features as 'beautiful', or strong feelings of dissonance between their former race and their ethnicity/cultural leanings, etc.