Edit, April 19: Fixed up his horn a little bit. c:
Alrighty, as suggested, a black dragon icon.
This is free use, with the standard rules that apply for such things.
(Feel free to use it, let people know where it came from. [A link to me via your signature is hugely appreciated, but not necessary.] Don't claim as your own or repost.)
I am still taking suggestions here
.Now available in green.