I can't imagine. I know they get that sulfurous, gassy smell when you boil them a long time, but wish I had an answer for you. If it was something they were eating, you'd taste it in other types of cooked eggs than boiled, as well. It should have nothing to do with the color of the egg. We only...
First, how long do you boil them? Could be you're boiling them too long? Boiled eggs always have a boiled egg smell, so I'm not sure what exactly you mean by an odor. This may help some:
http://www.wikihow.com/Hard-Boil-an-Egg