I changed my computer back to 10.04 so i cant do it. Although when i mess with 
nvidia-settings i can create a similar  effect. When i change my second monitor 
position to be on the first so they overlapping a similar effect appears.
Could you try it?
1. nvidia setting.
2. the smaller monitor on top of the other.
3. apply

>From this i came to the conclusion that maybe the bigger resolution
screen(my primary,first) is draw the background first. After this the
smaller(second monitor) draws or initializes on top of it. Finally the
display manager moves the second to its place and didn't redraw the
primary wallpaper. This is just an idea how this effect happens.

Also if i dowload a program(wallpaper changer) and set to change the
wallpaper every time on login the effect disappeared. I cant find the
name of the program sorry(it was in synaptic).

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https://bugs.launchpad.net/bugs/775920

Title:
  unity wallpaper looks corrupted after login

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