Pretty old concept that I applied to a pony months ago in the form of an OC villian character.
Decided to work it out finally!
There is some back story although maybe not a lot of specific details. Main thing is the binary world taking a presence into the physical world's dimensions.
She thought it was harmless, until her researches into the binary world led to a digital infection spreading into a physical form through the use of her body.
Numbers have replaced most of her old self, either adapting to show her old appearance or fragmenting into 0 and 1
Her mind is slowly fading as the infection takes over slowly. She still remains concious but loses control of her intention and goals as the binary world is seeking to spread its influence into the equestrian world.
Experimented a bit with the brightness of the overall piece and in certain areas. Not sure about the results but I do quite like the feel her lighted tail has...
Heh, oh well, more tests must be done!