I've seen people of all races pull it off well, Asians, Whites, Latinos... What about Depp in Pirates of the Caribbean? I think his looked really cool. Lots of other white guys pull it off.
It's more about the shape of a persons face and personality I think. But lots people who get dreads aren't really doing it to look "good" the want to look kind of freaky and strange.
Don't Look good majority. It tends to look like stringy rope, and the top tend to look like the ginger pictured. Latinos of varying african descent can pull it off the har is easier to twist, and with African people's if twisted and left alone, it will dread. Don't really need to put anything in it to dread it, but to keep it looking good. I had some small growth in college.
Depp look durty in POC.
A funny thing I used to do in high school was to take some Dax hair grease (it was like axle grease), after I had a temple fade, and put in in my hair and massaged it in. I did this until I had hundres of little tight balls or "peas" in my head, making my head "peasy". This was a cool look when you have a temple fade (only the temples and back faded up) and had the hairline edged up...