Awww what a cutie!! You should keep him(her?)! I wouldn't take it back knowing it has no future. At least you have given him a chance. I would warn you my friend took in a ferral (sp?) cat and it lived with her 5 years before escaping back into the wild...I guess it never got over the taste of living in the wild. Just be careful.
I like the name Donatello if it turns out to be a girl you can call her Donatella or Donna for short

I like the name Donatello if it turns out to be a girl you can call her Donatella or Donna for short