Well.. I had a few pictures showing how I made a turtle, but then I lost them...
But, to answer your question Ominous, the glass is already colored before I melt it.
Frenzie, I'm sure you'll have a lot of fun, and the only thing you need to be worried about other than burning yourself, is heating the glass too quickly and watching all the pieces explode all over the place. Hot glass flying through the air really hurts.
I don't have the one for the turtles, but this might help;
It's just a clear ball I'm playing with that has a colored center, though you can't see that because it's all really hot. What I'm doing in the last two pictures is letting it melt down and flattening it. After that, I would twist it around and get a spiral effect. It looks really cool when I’m done.