Well what i was saying before was first
Make a new sig
then press D to get the default colours Black and White
then go to filter -> Render -> Clouds
and do that until you get a verry contrasting background
then put your render in the picture and press Ctrl J to copy it
then on the top copy go to Filter -> Blur -> Motion Blur
put the settings as -45 if your render is on the right and 45 if your render is on the left and then for pixels use 50
after you do that copy the blurred render a couple of times and move them around until you cover the whole sig. then you want to hide all layers but the blurred ones and clikc Merge Visible.
After that make that layer Overlay and then copy the original render and move it above the blurred layer
Then after that do what you please

hope it helps