Any tweaks/themes that hide the grey/transparent area behind the clock and slider on the lock screen, making it 100% transparent?
I'm sure you could find some on Cydia by looking for things like Invisible Slider or what have you. But attached is a basic clear lockscreen theme I threw together a while back--it will still show the clock, statusbar, and a slider (you can replace the image included with one of your own if you'd like) but otherwise should be clear. Just unzip it and pop the folder in with your Winterboard themes.