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One of the primary reasons why people jailbreak their iPhone is to be able to customize the look and feel of iOS with themes and icons. This might seem lie putting form ahead of function, but customizing the platform is actually a good way of personalizing the platform, and making it easier to sue.
One of the best tools for doing this is WinterBoard. Once installed, it allows you to customize the look and feel of your iPhone by downloading and installing themes.
One of the biggest complaints I hear levelled against Apple is that the company has chosen to bury important--and much used--settings under layers of menus. For example, take something as simple as switching Bluetooth or Wi-Fi off and on.
SBSettings changes this by putting the settings that you want close to hand.