I use hostas and impatiens in my shadiest areas. That way, there is the perennial that kind of adds structure to the area and then I can use whatever color of impatiens I want - different each year :) The impatiens do need a good bit of water though. The hostas come in some really pretty varieties - deep ridges in the leaves or variegated colors with yellows and whites. Those things are so reliable - at least where we live. (Ohio) You can also divide them up each year.
Here is an area we planted with the above - freshly planted here. This year, they are at least twice the size.
http://img.photobucket.com/albums/v1...en/garden8.jpg
edit: Love the pictures K9soul!! My favorite is in your middle picture.:)