I'm not exactly sure what you are asking.
Do you want this exact scroll rendered so you can put it in your sig, or are you asking how do you get a blank scroll like this that you can use to type on top of?
If you just want the exact scroll cut out, then you just need to render it like any other photo. Below is the link to a guide of how to make a render.
If you want a scroll like this, but want it blank so you can type your own lines on it, you will either find a new image of a blank scroll, or try and play with tools such as the "Clone Stamp Tool".