I haven't logged in for a while so sorry about that.
The clock on the unlock screen can be gotten rid of by installing Lockscreen Clock Hide in Cydia.
Unless you mean the status bar, then you would have to look it up. Shouldn't be that difficult.
As for the background, you have to look up how to SSH. [Assuming you don't know how to] It's basically accessing your iPhone's files remotely. I had to manually put the background image in to the theme's files.
The comment's section of this:
http://angelman8.deviantart.com/art/...ne-4-175481865
Addresses most of the problems with it. What you have to do is find the theme's folder and replace the black background image with yours. [the image must have the same resolution/size] If you have any questions, just ask me.