"The body is obsolete" (HAHAHA) Stelarc http://www.stelarc.va.com.au/
Stelarc's ideas for the post human body are quite ingenious in the ways that they strive to make the human body much more technologically efficient than it currently is, using technologies that are currently for use outside the body... Stelarc's idea for synthetic skin is probably quite marketable to those with enough capital and a need for a skin which can absorb oxygen into it's pores rather than the it having to be taken into the respiratory system by breathing, which no doubt actually wastes energy. The technology of synthetic skin is probably quite useful to certain groups of people, maybe sportspersons for example, as they would not have to perform the physical act of breathing, which would maybe save them some energy which can then be put into their sport and improve stamina? Also they could peform for longer, if their skin was able process chemicals and turn them into nutrients, because this might eliminate the need to stop for food and water, and would surely be an ongoing process.... maybe Stelarc could invent a system which could be fitted inside the body which would eliminate the need for sleep, which would make humans as efficient as robots and uber-employable!
Orlan has been using her body and plastic surgery since 1990, and she uses her operations as performances, rather than private surgical procedures. For her, the process of plastic surgery to enhance beauty is as important as the finished product is for others who go under the knife.
She is using her face as a canvas in order to create her own image of beauty using works of art as the ideal picture of beauty, but she does not have any regard for what the rest of humanity considers to be beautiful. As a feminist she is trying to show the ideals of beauty are not perfection but impossible to achieve. Orlan beleieves "the acceptance of one's natural self to be a primitive concept, given the technology of our time, and therefore does not believe that nature must be abided." (http://www.digibodies.org/online/orlan.htm) 
Orlan
