Found a picture of an injected thin skin crown with dark (1b?) hair:
http://i01.i.aliimg.com/photo/v0/5182749...toupee.jpg
Really does look 100% normal in a way that lace never completely seems to (except with the light colors as hairenough pointed out). I'm honestly not even 100% sold that picture isn't just someone's real growing hair, except that the wig retailer it's from has numerous honest photos of all their products on their page, and everything seems legitimate.
This one looks a tiny bit less natural - not sure why but it has more of that "doll hair" effect. Still fantastic in my opinion, though:
http://i00.i.aliimg.com/photo/v0/4896319...toupee.jpg
Regarding the full head bond and the suction effect, I can imagine this is why got2b glued would be really good for skin, no?