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I use the 'Glasklart HD Lock Screen' option from the Glasklart HD theme for this exact function, it also removes the black bars from behind the clock so the screen is transparent.

You can do this without using the entire theme, which is how I use it.
 

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I really like Glasklart but some of my apps' icons aren't themed. What's the best place to get other icons? Macthemes?
 
The tweak you are looking for is in Cydia calked Clear Lockscreen 4.0. Use it with winterboard. No need for Glasklart theme.
 
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