I'm getting the pink screen too with my late 2012 Mac Mini. I have two monitors hooked up, both DVI. (Using HDMI->DVI, and mini DisplayPort -> DVI adapters)
It's definitely not the monitors at fault. The colors will be fine on one, and pink on the other. Strangely, the mouse cursor is always the correct color. The drop shadow around it causes anything under it to appear correct as well. The rainbow spinning cursor shows correctly as well. I'll try and get a photo of that next time it happens.
To fix it, I have to unplug a monitor to force redetection and then everything works. It also doesn't matter what monitor is unplugged -- I left the pink monitor plugged in and unplugged the correct one, OS X fixed itself, then I plugged the second monitor back in.