s2 Flexible Squares, works on all layout types, doesn't work with navigation strips and works better without a header (you can add a header, but it's coded with absolutes.)
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boleyn, feel free to watch
hallwayclocks for more. You many use the picture of Romeo + Juliet if you want to :)
Depending on what you add in your sidebar, you may have to change the height of the sidebar and the "top" of the footer. You can do so by finding this code in the #sidebar:
height: 270px;
Makes the sidebar longer.
top: 300px;
Moves down the footer so it doesn't overlap your sidebar.