Clearly a display issue. Could check with Apple Support on Twitter about it. Looking like a replacement at the very least though.
"Does anyone know what happened to my mac?"
We are too far away to know, but you can know in 45 seconds….
Restart while holding the command and R keys for 45 seconds.
Now how does it look?
"Clear image, but no color."
Then it is a software issue. Choose to "Reinstall OS X".
"Still all messed up."
Then it needs hardware repair, so take it to an Apple Authorized repair shop. You cannot repair it yourself.
The graphics system has failed somewhere. A local computer repair shop will be able to tell you exactly what the problem is, if it is fixable and what it will cost.
Integrated graphics or GPU probably got fried… go see an apple specialist about this.