Doesnt look like it no. Unless you remove the sense lockscreen.apk (name of which I don't know) and you can have a vanilla android style lockscreen which you can theme.
Or, you could decompile that lockscreen apk and swap out the images for your own, if you're feeling artistic. In fact, if you're just changing the images, you could probably drop the replacement images in using winrar rather than decompiling it (have to put .zip on the end of the filename though)