I am using the "Fresca" template. However, blue is not my color of choice:) I have already chaned the nav menu colors and I am left with one spot of blue- the area covered by nav_bar_bg.png . Is it possible to alter *just* the area covered by that image file? If I remove it, the whole are changes color, not just the spot nav_bar_bg.png was in.

Have you published the page so we can see it?