The General preferences pane is a mixture of interface commands. You have two Appearance options: if you move from Aqua to Graphite, all the colored buttons turn gray -- Apple's concession to graphics pros who didn't want the colored interface elements to get in the way of their work.
From here, you can also choose whether the leftmost menu in the menu bar is the name of the currently-running application in bold or just that application's icon. Likewise, you can set scroll bar behavior, the text-highlight color, and whether double-clicking on a window's title bar will minimize that window.
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