After a jailbreak, use Winterboard to change themes and icons easily.
I love the customization options on a jailbroken phone...some are tacky, yes, and some are nice and clean.
This was my last screen on my 4S before upgrading to the 5. I rather think it's pretty classy. Can't wait for the 5 jailbreak to become available.
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While I like the 5 better than the 4S, and I'm even getting along just fine without my jailbreak tweaks (so it was worth the upgrade to me), I do think the above looks much nicer than this, which is my current homescreen:
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