Red/Blue color palate reversed

I have an unusual issue that's driving me insane. The red and blue color palate of my Iphone 3GS has switched. What should display as blue shows red, and vice versa. Oddly, green is normal, as is white and black. I'd thought initially that I'd accidently turned on some kind of accesability feature, but when I checked it was off and, when turned on, reversed the white and black, not the blue and red.

I've tried restoring my phone but that didn't work. The oddest part, it's intermittent. At first it would happen once in a while, but now it's usually reversed. Turning the screen on and off will eventually get me to a normal color scheme, but if it turns off I'm back to square one. Anyone have any idea what's going on here?