Help Requested: How to Cover Up Edges?

Hello guys. So I have a psd file that has been worked by a graphic designer and I always take this layer (the one in the picture attached) from his psd file, and I noticed that during my work I need it so much so that I can cover the edges of my pen tool cut layers so I put one of those on every edge. How can I make a similar layer? And how can I lets say make a cloudy one with low opacity from 1 end and full opacity on the other end just like this photo. And Thank u

 

1) Just copy what you have and transform it to "reflect" or "flip". Modify it to what you need done.
2) http://www.tek-tips.com/viewthread.cfm?qid=501289

 

Ya I know but I want to learn how to make a similar layer myself. The link didnt open.

 

Try this? http://www.sitepoint.com/photoshop-fade-layer-mask/

 

Thank u very much man, ur help is appreciated.