Remember in "End of Time", there was that woman who was ment to be the Doctor's mother?<---her?
Well, then you probably remember how she had her eyes covered like a Weeping Angel.
Here is the cool theory I found:
"I heard that the reason they made her put her hands like that was a Timelord form of disgrace. And that she was stuck in limbo forever, until her and the other disgraced Timelords became the first weeping angels. Monsters forced into feeding of time energy, as it used to run through their veins. Now their veins were stone they need to get it other ways."
-RiverTheDetective on tumblr
If you can navigate around that grammatical train wreck, good for you.
It makes sense. Pretty much right after we see her face, the Doctor sends them through the Untempered Schism back to Gallifrey during the Last Great Time War. No one ever said that they made it back or what happened once they got there. This theory would say that they were thrown to the dawn of the universe and evolved into the angels.
What do you think?
Comment!