What are some good websites to look up tattoo fonts?

I'm looking it up on my cell phone, so mobile sites are better.

Is it possible to get a new tattoo to look as if it is underneath an old tattoo which is just black lettering?

i hope people can actually understand what i'm trying to ask.
i have a black lettering tattoo and want to make it look more interesting by adding to it. i was thinking something like a red flower but i dont know if it is possible to get the effect of the flower being behind the words.