backdrop of items color changed?

I recently went on my computer and lo, to my surprise the background for my icons (when you single click) is not blue but green? Also every background on Display properties, in the favorites (when you highlight them. Every windows background item is green, the background behind the letters/numbers. When into display, everything is set to default, or the color blue. Experimented with different settings and still no blue, even the download squares are green.? Any suggestions would be helpful.