I was going to say that I'd want to replicate Cole McGrath's tattoos from the second game, but that's a lot of extensive tattooing and I don't like needles.
So, instead:
http://th02.deviantart.net/fs41/150/f/2009/012/0/a/Shadow_the_Hedgehog_symbol_by_Saby96.jpg
Bad game, cool character.