You might have seen these, but they seem appropriate for birthdays somehow.
Who Knows What We May Become (http://isaia.deviantart.com/art/Who-Knows-What-We-May-Become-34198240): The Gaang as adults. To be sure we now have canon versions of their grown-up selves, but I still love this version.
More Than I Once Was (http://isaia.deviantart.com/art/More-than-What-I-once-Was-fin-33583968): Iroh, Roku and others as young men.
no subject
Who Knows What We May Become (http://isaia.deviantart.com/art/Who-Knows-What-We-May-Become-34198240): The Gaang as adults. To be sure we now have canon versions of their grown-up selves, but I still love this version.
More Than I Once Was (http://isaia.deviantart.com/art/More-than-What-I-once-Was-fin-33583968): Iroh, Roku and others as young men.
And this one, just because it's cute:
Avatar Gender Bender (http://carrinth.deviantart.com/art/Avatar-Gender-Bender-54533168)