I like the footer being red and the smaller text. The rounded corners don't really fit nor do they add anything to the over all design. I think a soft wrapper shadow along both sides and the original header would fit great with your "Plain Vanilla" approach, add in Thelma and jlhaslip's suggestions and call it done.
Just a foot note: I love the idea of Plain Vanilla Designs. I think that could be a real niche for you. I think realistically you could come up with two or three simple, yet classy designs and sell them over and over and over.