Okay, Gaieus, if you wish to give Tony a pass on hijacking your thread,
perhaps I'll mention to him that he can edit an existing texture and
make it darker simply by fiddling with the darkness slider in the
Material Editor. In fact, Tony, if you load an existing texture into
the Bucket tool and then select "Create" in the Material editor, you
get the opportunity to clone the existing color, assign it a new name,
and change its properties--such as making it darker. In this way, you
can create a family of textures all sharing the same basic image but
exhibiting a range of darknesses, or transparencies, or hues, and so
forth.
Tony, you really need to make an effort to learn the mechanics of
interacting properly with this group, as well as the basics of group
etiquette generally.
-Gully