how can i fix my desktop background and icons problem?

recently i found a photo that i like very much on the internet.
I right clicked on the photo and set it as a background.A window poped up that i dont remember exactly what it says but it was something about cutomizing.Anyway i clicked "Yes " and the picture was set, but it looked a little blury.I found another way by saving the same picture first and than set it as a bacground but when i did this the first picture ( the blury one ) it remain on my desktop and now there are 2 pictures dividing the screen.Also all the icons turned blue(same thing when you select an icon to deleted or something)Please help me if you can.
The best